/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "access/htup_details.h"
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#include "access/xact.h"
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#include "executor/tuptable.h"
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#include "nodes/execnodes.h"
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#include "nodes/extensible.h"
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#include "nodes/nodes.h"
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#include "nodes/plannodes.h"
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#include "rewrite/rewriteHandler.h"
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#include "storage/bufmgr.h"
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#include "utils/rel.h"
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#include "executor/cypher_executor.h"
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#include "executor/cypher_utils.h"
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#include "nodes/cypher_nodes.h"
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#include "utils/agtype.h"
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#include "utils/graphid.h"
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static void begin_cypher_set(CustomScanState *node, EState *estate,
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int eflags);
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static TupleTableSlot *exec_cypher_set(CustomScanState *node);
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static void end_cypher_set(CustomScanState *node);
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static void rescan_cypher_set(CustomScanState *node);
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static void process_update_list(CustomScanState *node);
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static HeapTuple update_entity_tuple(ResultRelInfo *resultRelInfo,
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TupleTableSlot *elemTupleSlot,
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EState *estate, HeapTuple old_tuple);
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const CustomExecMethods cypher_set_exec_methods = {SET_SCAN_STATE_NAME,
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begin_cypher_set,
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exec_cypher_set,
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end_cypher_set,
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rescan_cypher_set,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL};
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static void begin_cypher_set(CustomScanState *node, EState *estate,
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int eflags)
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{
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cypher_set_custom_scan_state *css =
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(cypher_set_custom_scan_state *)node;
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Plan *subplan;
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Assert(list_length(css->cs->custom_plans) == 1);
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subplan = linitial(css->cs->custom_plans);
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node->ss.ps.lefttree = ExecInitNode(subplan, estate, eflags);
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ExecAssignExprContext(estate, &node->ss.ps);
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ExecInitScanTupleSlot(estate, &node->ss,
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ExecGetResultType(node->ss.ps.lefttree),
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&TTSOpsHeapTuple);
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if (!CYPHER_CLAUSE_IS_TERMINAL(css->flags))
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{
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TupleDesc tupdesc = node->ss.ss_ScanTupleSlot->tts_tupleDescriptor;
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ExecAssignProjectionInfo(&node->ss.ps, tupdesc);
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}
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/*
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* Postgres does not assign the es_output_cid in queries that do
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* not write to disk, ie: SELECT commands. We need the command id
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* for our clauses, and we may need to initialize it. We cannot use
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* GetCurrentCommandId because there may be other cypher clauses
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* that have modified the command id.
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*/
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if (estate->es_output_cid == 0)
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{
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estate->es_output_cid = estate->es_snapshot->curcid;
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}
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Increment_Estate_CommandId(estate);
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}
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static HeapTuple update_entity_tuple(ResultRelInfo *resultRelInfo,
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TupleTableSlot *elemTupleSlot,
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EState *estate, HeapTuple old_tuple)
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{
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HeapTuple tuple = NULL;
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LockTupleMode lockmode;
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TM_FailureData hufd;
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TM_Result lock_result;
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Buffer buffer;
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bool update_indexes;
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TM_Result result;
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CommandId cid = GetCurrentCommandId(true);
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ResultRelInfo **saved_resultRels = estate->es_result_relations;
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estate->es_result_relations = &resultRelInfo;
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lockmode = ExecUpdateLockMode(estate, resultRelInfo);
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lock_result = heap_lock_tuple(resultRelInfo->ri_RelationDesc, old_tuple,
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GetCurrentCommandId(false), lockmode,
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LockWaitBlock, false, &buffer, &hufd);
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if (lock_result == TM_Ok)
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{
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ExecOpenIndices(resultRelInfo, false);
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ExecStoreVirtualTuple(elemTupleSlot);
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tuple = ExecFetchSlotHeapTuple(elemTupleSlot, true, NULL);
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tuple->t_self = old_tuple->t_self;
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// Check the constraints of the tuple
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tuple->t_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
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if (resultRelInfo->ri_RelationDesc->rd_att->constr != NULL)
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{
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ExecConstraints(resultRelInfo, elemTupleSlot, estate);
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}
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result = table_tuple_update(resultRelInfo->ri_RelationDesc,
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&tuple->t_self, elemTupleSlot,
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cid, estate->es_snapshot,
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estate->es_crosscheck_snapshot,
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true /* wait for commit */ ,
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&hufd, &lockmode, &update_indexes);
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if (result == TM_SelfModified)
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{
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if (hufd.cmax != cid)
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{
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ereport(ERROR,
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(errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
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errmsg("tuple to be updated was already modified")));
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}
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ExecCloseIndices(resultRelInfo);
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estate->es_result_relations = saved_resultRels;
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return tuple;
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}
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if (result != TM_Ok)
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{
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ereport(ERROR, (errcode(ERRCODE_INTERNAL_ERROR),
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errmsg("Entity failed to be updated: %i", result)));
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}
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// Insert index entries for the tuple
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if (resultRelInfo->ri_NumIndices > 0 && update_indexes)
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{
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ExecInsertIndexTuples(resultRelInfo, elemTupleSlot, estate, false, false, NULL, NIL);
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}
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ExecCloseIndices(resultRelInfo);
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}
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else if (lock_result == TM_SelfModified)
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{
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if (hufd.cmax != cid)
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{
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ereport(ERROR,
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(errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
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errmsg("tuple to be updated was already modified")));
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}
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}
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else
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{
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ereport(ERROR, (errcode(ERRCODE_INTERNAL_ERROR),
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errmsg("Entity failed to be updated: %i", lock_result)));
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}
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ReleaseBuffer(buffer);
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estate->es_result_relations = saved_resultRels;
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return tuple;
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}
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/*
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* When the CREATE clause is the last cypher clause, consume all input from the
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* previous clause(s) in the first call of exec_cypher_create.
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*/
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static void process_all_tuples(CustomScanState *node)
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{
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cypher_set_custom_scan_state *css = (cypher_set_custom_scan_state *)node;
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TupleTableSlot *slot;
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EState *estate = css->css.ss.ps.state;
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do
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{
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process_update_list(node);
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Decrement_Estate_CommandId(estate)
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slot = ExecProcNode(node->ss.ps.lefttree);
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Increment_Estate_CommandId(estate)
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} while (!TupIsNull(slot));
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}
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/*
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* Checks the path to see if the entities contained within
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* have the same graphid and the updated_id field. Returns
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* true if yes, false otherwise.
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*/
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static bool check_path(agtype_value *path, graphid updated_id)
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{
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int i;
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for (i = 0; i < path->val.array.num_elems; i++)
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{
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agtype_value *elem = &path->val.array.elems[i];
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agtype_value *id = GET_AGTYPE_VALUE_OBJECT_VALUE(elem, "id");
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if (updated_id == id->val.int_value)
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{
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return true;
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}
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}
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return false;
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}
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/*
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* Construct a new agtype path with the entity with updated_id
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* replacing all of its instances in path with updated_entity
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*/
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static agtype_value *replace_entity_in_path(agtype_value *path,
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graphid updated_id,
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agtype *updated_entity)
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{
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agtype_iterator *it;
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agtype_iterator_token tok = WAGT_DONE;
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agtype_parse_state *parse_state = NULL;
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agtype_value *r;
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agtype_value *parsed_agtype_value = NULL;
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agtype *prop_agtype;
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int i;
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r = palloc(sizeof(agtype_value));
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prop_agtype = agtype_value_to_agtype(path);
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it = agtype_iterator_init(&prop_agtype->root);
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tok = agtype_iterator_next(&it, r, true);
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parsed_agtype_value = push_agtype_value(&parse_state, tok,
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tok < WAGT_BEGIN_ARRAY ? r : NULL);
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// Iterate through the path, replace entities as necessary.
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for (i = 0; i < path->val.array.num_elems; i++)
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{
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agtype_value *id, *elem;
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elem = &path->val.array.elems[i];
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// something unexpected happened, throw an error.
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if (elem->type != AGTV_VERTEX && elem->type != AGTV_EDGE)
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{
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ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("unsupported agtype found in a path")));
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}
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// extract the id field
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id = GET_AGTYPE_VALUE_OBJECT_VALUE(elem, "id");
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/*
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* Either replace or keep the entity in the new path, depending on the id
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* check.
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*/
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if (updated_id == id->val.int_value)
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{
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parsed_agtype_value = push_agtype_value(&parse_state, WAGT_ELEM,
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get_ith_agtype_value_from_container(&updated_entity->root, 0));
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}
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else
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{
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parsed_agtype_value = push_agtype_value(&parse_state, WAGT_ELEM,
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elem);
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}
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}
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parsed_agtype_value = push_agtype_value(&parse_state, WAGT_END_ARRAY, NULL);
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parsed_agtype_value->type = AGTV_PATH;
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return parsed_agtype_value;
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}
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/*
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* When a vertex or edge is updated, we need to update the vertex
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* or edge if it is contained within a path. Scan through scanTupleSlot
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* to find all paths and check if they need to be updated.
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*/
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static void update_all_paths(CustomScanState *node, graphid id,
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agtype *updated_entity)
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{
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cypher_set_custom_scan_state *css = (cypher_set_custom_scan_state *)node;
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ExprContext *econtext = css->css.ss.ps.ps_ExprContext;
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TupleTableSlot *scanTupleSlot = econtext->ecxt_scantuple;
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int i;
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for (i = 0; i < scanTupleSlot->tts_tupleDescriptor->natts; i++)
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{
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agtype *original_entity;
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agtype_value *original_entity_value;
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// skip nulls
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if (scanTupleSlot->tts_tupleDescriptor->attrs[i].atttypid != AGTYPEOID)
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{
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continue;
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}
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// skip non agtype values
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if (scanTupleSlot->tts_isnull[i])
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{
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continue;
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}
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original_entity = DATUM_GET_AGTYPE_P(scanTupleSlot->tts_values[i]);
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// if the value is not a scalar type, its not a path
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if (!AGTYPE_CONTAINER_IS_SCALAR(&original_entity->root))
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{
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continue;
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}
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original_entity_value = get_ith_agtype_value_from_container(&original_entity->root, 0);
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// we found a path
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if (original_entity_value->type == AGTV_PATH)
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{
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// check if the path contains the entity.
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if (check_path(original_entity_value, id))
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{
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// the path does contain the entity replace with the new entity.
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agtype_value *new_path = replace_entity_in_path(original_entity_value, id, updated_entity);
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scanTupleSlot->tts_values[i] = AGTYPE_P_GET_DATUM(agtype_value_to_agtype(new_path));
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}
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}
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}
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}
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static void process_update_list(CustomScanState *node)
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{
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cypher_set_custom_scan_state *css = (cypher_set_custom_scan_state *)node;
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ExprContext *econtext = css->css.ss.ps.ps_ExprContext;
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TupleTableSlot *scanTupleSlot = econtext->ecxt_scantuple;
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ListCell *lc;
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EState *estate = css->css.ss.ps.state;
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int *luindex = NULL;
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int lidx = 0;
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/* allocate an array to hold the last update index of each 'entity' */
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luindex = palloc0(sizeof(int) * scanTupleSlot->tts_nvalid);
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/*
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* Iterate through the SET items list and store the loop index of each
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* 'entity' update. As there is only one entry for each entity, this will
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* have the effect of overwriting the previous loop index stored - if this
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* 'entity' is used more than once. This will create an array of the last
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* loop index for the update of that particular 'entity'. This will allow us
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* to correctly update an 'entity' after all other previous updates to that
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* 'entity' have been done.
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*/
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foreach (lc, css->set_list->set_items)
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{
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cypher_update_item *update_item = NULL;
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update_item = (cypher_update_item *)lfirst(lc);
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luindex[update_item->entity_position - 1] = lidx;
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/* increment the loop index */
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lidx++;
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}
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/* reset loop index */
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lidx = 0;
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/* iterate through SET set items */
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foreach (lc, css->set_list->set_items)
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{
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agtype_value *altered_properties;
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agtype_value *original_entity_value;
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agtype_value *original_properties;
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agtype_value *id;
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agtype_value *label;
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agtype *original_entity;
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agtype *new_property_value;
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TupleTableSlot *slot;
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ResultRelInfo *resultRelInfo;
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ScanKeyData scan_keys[1];
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TableScanDesc scan_desc;
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bool remove_property;
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char *label_name;
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cypher_update_item *update_item;
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Datum new_entity;
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HeapTuple heap_tuple;
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char *clause_name = css->set_list->clause_name;
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int cid;
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update_item = (cypher_update_item *)lfirst(lc);
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/*
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* If the entity is null, we can skip this update. this will be
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* possible when the OPTIONAL MATCH clause is implemented.
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*/
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if (scanTupleSlot->tts_isnull[update_item->entity_position - 1])
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{
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continue;
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}
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if (scanTupleSlot->tts_tupleDescriptor->attrs[update_item->entity_position -1].atttypid != AGTYPEOID)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("age %s clause can only update agtype",
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clause_name)));
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}
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original_entity = DATUM_GET_AGTYPE_P(scanTupleSlot->tts_values[update_item->entity_position - 1]);
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original_entity_value = get_ith_agtype_value_from_container(&original_entity->root, 0);
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if (original_entity_value->type != AGTV_VERTEX &&
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original_entity_value->type != AGTV_EDGE)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("age %s clause can only update vertex and edges",
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clause_name)));
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}
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/* get the id and label for later */
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id = GET_AGTYPE_VALUE_OBJECT_VALUE(original_entity_value, "id");
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label = GET_AGTYPE_VALUE_OBJECT_VALUE(original_entity_value, "label");
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label_name = pnstrdup(label->val.string.val, label->val.string.len);
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/* get the properties we need to update */
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original_properties = GET_AGTYPE_VALUE_OBJECT_VALUE(original_entity_value,
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"properties");
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/*
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* Determine if the property should be removed. This will be because
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* this is a REMOVE clause or the variable references a variable that is
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* NULL. It will be possible for a variable to be NULL when OPTIONAL
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* MATCH is implemented.
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*/
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if (update_item->remove_item)
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{
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remove_property = true;
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}
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else
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{
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remove_property = scanTupleSlot->tts_isnull[update_item->prop_position - 1];
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}
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/*
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* If we need to remove the property, set the value to NULL. Otherwise
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* fetch the evaluated expression from the tuple slot.
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*/
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if (remove_property)
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{
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new_property_value = NULL;
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}
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else
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{
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new_property_value = DATUM_GET_AGTYPE_P(scanTupleSlot->tts_values[update_item->prop_position - 1]);
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}
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// Alter the properties Agtype value.
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if (strcmp(update_item->prop_name, ""))
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{
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altered_properties = alter_property_value(original_properties,
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update_item->prop_name,
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new_property_value,
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remove_property);
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}
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else
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{
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altered_properties = alter_properties(
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update_item->is_add ? original_properties : NULL,
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new_property_value);
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/*
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* For SET clause with plus-equal operator, nulls are not removed
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* from the map during transformation because they are required in
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* the executor to alter (merge) properties correctly. Only after
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* that step, they can be removed.
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*/
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if (update_item->is_add)
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{
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remove_null_from_agtype_object(altered_properties);
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}
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}
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resultRelInfo = create_entity_result_rel_info(
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estate, css->set_list->graph_name, label_name);
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slot = ExecInitExtraTupleSlot(
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estate, RelationGetDescr(resultRelInfo->ri_RelationDesc),
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&TTSOpsHeapTuple);
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/*
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* Now that we have the updated properties, create a either a vertex or
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* edge Datum for the in-memory update, and setup the tupleTableSlot
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* for the on-disc update.
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*/
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if (original_entity_value->type == AGTV_VERTEX)
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{
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new_entity = make_vertex(GRAPHID_GET_DATUM(id->val.int_value),
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CStringGetDatum(label_name),
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AGTYPE_P_GET_DATUM(agtype_value_to_agtype(altered_properties)));
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slot = populate_vertex_tts(slot, id, altered_properties);
|
}
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else if (original_entity_value->type == AGTV_EDGE)
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{
|
agtype_value *startid = GET_AGTYPE_VALUE_OBJECT_VALUE(original_entity_value, "start_id");
|
agtype_value *endid = GET_AGTYPE_VALUE_OBJECT_VALUE(original_entity_value, "end_id");
|
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new_entity = make_edge(GRAPHID_GET_DATUM(id->val.int_value),
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GRAPHID_GET_DATUM(startid->val.int_value),
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GRAPHID_GET_DATUM(endid->val.int_value),
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CStringGetDatum(label_name),
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AGTYPE_P_GET_DATUM(agtype_value_to_agtype(altered_properties)));
|
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slot = populate_edge_tts(slot, id, startid, endid,
|
altered_properties);
|
}
|
else
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{
|
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
errmsg("age %s clause can only update vertex and edges",
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clause_name)));
|
}
|
|
/* place the datum in its tuple table slot position. */
|
scanTupleSlot->tts_values[update_item->entity_position - 1] = new_entity;
|
|
/*
|
* If the tuple table slot has paths, we need to inspect them to see if
|
* the updated entity is contained within them and replace the entity
|
* if it is.
|
*/
|
update_all_paths(node,
|
id->val.int_value, DATUM_GET_AGTYPE_P(new_entity));
|
|
/*
|
* If the last update index for the entity is equal to the current loop
|
* index, then update this tuple.
|
*/
|
cid = estate->es_snapshot->curcid;
|
estate->es_snapshot->curcid = GetCurrentCommandId(false);
|
|
if (luindex[update_item->entity_position - 1] == lidx)
|
{
|
/*
|
* Setup the scan key to require the id field on-disc to match the
|
* entity's graphid.
|
*/
|
ScanKeyInit(&scan_keys[0], 1, BTEqualStrategyNumber, F_GRAPHIDEQ,
|
GRAPHID_GET_DATUM(id->val.int_value));
|
/*
|
* Setup the scan description, with the correct snapshot and scan
|
* keys.
|
*/
|
scan_desc = table_beginscan(resultRelInfo->ri_RelationDesc,
|
estate->es_snapshot, 1, scan_keys);
|
/* Retrieve the tuple. */
|
heap_tuple = heap_getnext(scan_desc, ForwardScanDirection);
|
|
/*
|
* If the heap tuple still exists (It wasn't deleted between the
|
* match and this SET/REMOVE) update the heap_tuple.
|
*/
|
if (HeapTupleIsValid(heap_tuple))
|
{
|
heap_tuple = update_entity_tuple(resultRelInfo, slot, estate,
|
heap_tuple);
|
}
|
/* close the ScanDescription */
|
table_endscan(scan_desc);
|
}
|
|
estate->es_snapshot->curcid = cid;
|
/* close relation */
|
ExecCloseIndices(resultRelInfo);
|
table_close(resultRelInfo->ri_RelationDesc, RowExclusiveLock);
|
|
/* increment loop index */
|
lidx++;
|
}
|
/* free our lookup array */
|
pfree(luindex);
|
}
|
|
static TupleTableSlot *exec_cypher_set(CustomScanState *node)
|
{
|
cypher_set_custom_scan_state *css = (cypher_set_custom_scan_state *)node;
|
ResultRelInfo **saved_resultRels;
|
EState *estate = css->css.ss.ps.state;
|
ExprContext *econtext = css->css.ss.ps.ps_ExprContext;
|
TupleTableSlot *slot;
|
|
saved_resultRels = estate->es_result_relations;
|
|
//Process the subtree first
|
Decrement_Estate_CommandId(estate);
|
slot = ExecProcNode(node->ss.ps.lefttree);
|
Increment_Estate_CommandId(estate);
|
|
if (TupIsNull(slot))
|
{
|
return NULL;
|
}
|
|
econtext->ecxt_scantuple =
|
node->ss.ps.lefttree->ps_ProjInfo->pi_exprContext->ecxt_scantuple;
|
|
if (CYPHER_CLAUSE_IS_TERMINAL(css->flags))
|
{
|
estate->es_result_relations = saved_resultRels;
|
|
process_all_tuples(node);
|
|
/* increment the command counter to reflect the updates */
|
CommandCounterIncrement();
|
|
return NULL;
|
}
|
|
process_update_list(node);
|
|
/* increment the command counter to reflect the updates */
|
CommandCounterIncrement();
|
|
estate->es_result_relations = saved_resultRels;
|
|
econtext->ecxt_scantuple = ExecProject(node->ss.ps.lefttree->ps_ProjInfo);
|
|
return ExecProject(node->ss.ps.ps_ProjInfo);
|
}
|
|
static void end_cypher_set(CustomScanState *node)
|
{
|
ExecEndNode(node->ss.ps.lefttree);
|
}
|
|
static void rescan_cypher_set(CustomScanState *node)
|
{
|
cypher_set_custom_scan_state *css = (cypher_set_custom_scan_state *)node;
|
char *clause_name = css->set_list->clause_name;
|
|
ereport(ERROR,
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
errmsg("cypher %s clause cannot be rescanned",
|
clause_name),
|
errhint("its unsafe to use joins in a query with a Cypher %s clause", clause_name)));
|
}
|
|
Node *create_cypher_set_plan_state(CustomScan *cscan)
|
{
|
cypher_set_custom_scan_state *cypher_css = palloc0(sizeof(cypher_set_custom_scan_state));
|
cypher_update_information *set_list;
|
char *serialized_data;
|
Const *c;
|
|
cypher_css->cs = cscan;
|
|
// get the serialized data structure from the Const and deserialize it.
|
c = linitial(cscan->custom_private);
|
serialized_data = (char *)c->constvalue;
|
set_list = stringToNode(serialized_data);
|
|
Assert(is_ag_node(set_list, cypher_update_information));
|
|
cypher_css->set_list = set_list;
|
cypher_css->flags = set_list->flags;
|
|
cypher_css->css.ss.ps.type = T_CustomScanState;
|
cypher_css->css.methods = &cypher_set_exec_methods;
|
|
return (Node *)cypher_css;
|
}
|
