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This feature allows jsonb data to be treated as a table and thus used in a FROM clause like other tabular data. Data can be selected from the jsonb using jsonpath expressions, and hoisted out of nested structures in the jsonb to form multiple rows, more or less like an outer join. Nikita Glukhov Reviewers have included (in no particular order) Andres Freund, Alexander Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zhihong Yu (whose name I previously misspelled), Himanshu Upadhyaya, Daniel Gustafsson, Justin Pryzby. Discussion: https://postgr.es/m/7e2cb85d-24cf-4abb-30a5-1a33715959bd@postgrespro.ru
58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_clause.h
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* handle clauses in parser
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*
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*
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* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/parser/parse_clause.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSE_CLAUSE_H
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#define PARSE_CLAUSE_H
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#include "parser/parse_node.h"
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extern void transformFromClause(ParseState *pstate, List *frmList);
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extern int setTargetTable(ParseState *pstate, RangeVar *relation,
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bool inh, bool alsoSource, AclMode requiredPerms);
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extern Node *transformWhereClause(ParseState *pstate, Node *clause,
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ParseExprKind exprKind, const char *constructName);
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extern Node *transformLimitClause(ParseState *pstate, Node *clause,
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ParseExprKind exprKind, const char *constructName,
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LimitOption limitOption);
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extern List *transformGroupClause(ParseState *pstate, List *grouplist,
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List **groupingSets,
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List **targetlist, List *sortClause,
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ParseExprKind exprKind, bool useSQL99);
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extern List *transformSortClause(ParseState *pstate, List *orderlist,
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List **targetlist, ParseExprKind exprKind,
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bool useSQL99);
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extern List *transformWindowDefinitions(ParseState *pstate,
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List *windowdefs,
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List **targetlist);
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extern List *transformDistinctClause(ParseState *pstate,
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List **targetlist, List *sortClause, bool is_agg);
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extern List *transformDistinctOnClause(ParseState *pstate, List *distinctlist,
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List **targetlist, List *sortClause);
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extern void transformOnConflictArbiter(ParseState *pstate,
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OnConflictClause *onConflictClause,
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List **arbiterExpr, Node **arbiterWhere,
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Oid *constraint);
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extern List *addTargetToSortList(ParseState *pstate, TargetEntry *tle,
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List *sortlist, List *targetlist, SortBy *sortby);
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extern Index assignSortGroupRef(TargetEntry *tle, List *tlist);
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extern bool targetIsInSortList(TargetEntry *tle, Oid sortop, List *sortList);
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/* functions in parse_jsontable.c */
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extern ParseNamespaceItem *transformJsonTable(ParseState *pstate, JsonTable *jt);
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#endif /* PARSE_CLAUSE_H */
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