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postgresql/src/include/parser/parse_target.h

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Break parser functions into smaller files, group together.
1997-11-25 23:07:18 +01:00
/*-------------------------------------------------------------------------
*
* parse_target.h
Extend pg_cast castimplicit column to a three-way value; this allows us to be flexible about assignment casts without introducing ambiguity in operator/function resolution. Introduce a well-defined promotion hierarchy for numeric datatypes (int2->int4->int8->numeric->float4->float8). Change make_const to initially label numeric literals as int4, int8, or numeric (never float8 anymore). Explicitly mark Func and RelabelType nodes to indicate whether they came from a function call, explicit cast, or implicit cast; use this to do reverse-listing more accurately and without so many heuristics. Explicit casts to char, varchar, bit, varbit will truncate or pad without raising an error (the pre-7.2 behavior), while assigning to a column without any explicit cast will still raise an error for wrong-length data like 7.3. This more nearly follows the SQL spec than 7.2 behavior (we should be reporting a 'completion condition' in the explicit-cast cases, but we have no mechanism for that, so just do silent truncation). Fix some problems with enforcement of typmod for array elements; it didn't work at all in 'UPDATE ... SET array[n] = foo', for example. Provide a generalized array_length_coerce() function to replace the specialized per-array-type functions that used to be needed (and were missing for NUMERIC as well as all the datetime types). Add missing conversions int8<->float4, text<->numeric, oid<->int8. initdb forced.
2002-09-18 23:35:25 +02:00
* handle target lists
Break parser functions into smaller files, group together.
1997-11-25 23:07:18 +01:00
*
*
Update copyright for 2006. Update scripts.
2006-03-05 16:59:11 +01:00
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
Add: * Portions Copyright (c) 1996-2000, PostgreSQL, Inc to all files copyright Regents of Berkeley. Man, that's a lot of files.
2000-01-26 06:58:53 +01:00
* Portions Copyright (c) 1994, Regents of the University of California
Break parser functions into smaller files, group together.
1997-11-25 23:07:18 +01:00
*
Change the row constructor syntax (ROW(...)) so that list elements foo.* will be expanded to a list of their member fields, rather than creating a nested rowtype field as formerly. (The old behavior is still available by omitting '.*'.) This syntax is not allowed by the SQL spec AFAICS, so changing its behavior doesn't violate the spec. The new behavior is substantially more useful since it allows, for example, triggers to check for data changes with 'if row(new.*) is distinct from row(old.*)'. Per my recent proposal.
2006-06-26 19:24:41 +02:00
* $PostgreSQL: pgsql/src/include/parser/parse_target.h,v 1.40 2006/06/26 17:24:41 tgl Exp $
Break parser functions into smaller files, group together.
1997-11-25 23:07:18 +01:00
*
*-------------------------------------------------------------------------
*/
#ifndef PARSE_TARGET_H
#define PARSE_TARGET_H
Change #include's to use <> and "" as appropriate.
1999-07-16 01:04:24 +02:00
#include "parser/parse_node.h"
Break parser functions into smaller files, group together.
1997-11-25 23:07:18 +01:00
Extend pg_cast castimplicit column to a three-way value; this allows us to be flexible about assignment casts without introducing ambiguity in operator/function resolution. Introduce a well-defined promotion hierarchy for numeric datatypes (int2->int4->int8->numeric->float4->float8). Change make_const to initially label numeric literals as int4, int8, or numeric (never float8 anymore). Explicitly mark Func and RelabelType nodes to indicate whether they came from a function call, explicit cast, or implicit cast; use this to do reverse-listing more accurately and without so many heuristics. Explicit casts to char, varchar, bit, varbit will truncate or pad without raising an error (the pre-7.2 behavior), while assigning to a column without any explicit cast will still raise an error for wrong-length data like 7.3. This more nearly follows the SQL spec than 7.2 behavior (we should be reporting a 'completion condition' in the explicit-cast cases, but we have no mechanism for that, so just do silent truncation). Fix some problems with enforcement of typmod for array elements; it didn't work at all in 'UPDATE ... SET array[n] = foo', for example. Provide a generalized array_length_coerce() function to replace the specialized per-array-type functions that used to be needed (and were missing for NUMERIC as well as all the datetime types). Add missing conversions int8<->float4, text<->numeric, oid<->int8. initdb forced.
2002-09-18 23:35:25 +02:00
Cleanup up include files.
1997-11-26 02:14:33 +01:00
extern List *transformTargetList(ParseState *pstate, List *targetlist);
Implement feature of new FE/BE protocol whereby RowDescription identifies the column by table OID and column number, if it's a simple column reference. Along the way, get rid of reskey/reskeyop fields in Resdoms. Turns out that representation was not convenient for either the planner or the executor; we can make the planner deliver exactly what the executor wants with no more effort. initdb forced due to change in stored rule representation.
2003-05-06 02:20:33 +02:00
extern void markTargetListOrigins(ParseState *pstate, List *targetlist);
Rewrite parser's handling of INSERT ... SELECT so that processing of the SELECT part of the statement is just like a plain SELECT. All INSERT-specific processing happens after the SELECT parsing is done. This eliminates many problems, e.g. INSERT ... SELECT ... GROUP BY using the wrong column labels. Ensure that DEFAULT clauses are coerced to the target column type, whether or not stored clause produces the right type. Substantial cleanup of parser's array support.
1999-07-19 02:26:20 +02:00
extern TargetEntry *transformTargetEntry(ParseState *pstate,
Ye-old pgindent run. Same 4-space tabs.
2000-04-12 19:17:23 +02:00
Node *node, Node *expr,
[ Revert patch ] > ================================================================= > User interface proposal for multi-row function targetlist entries > ================================================================= > 1. Only one targetlist entry may return a set. > 2. Each targetlist item (other than the set returning one) is > repeated for each item in the returned set. > Having gotten no objections (actually, no response at all), I can only assume no one had heartburn with this change. The attached patch covers the first of the two proposals, i.e. restricting the target list to only one set returning function. Joe Conway
2003-02-13 06:53:46 +01:00
char *colname, bool resjunk);
Change the row constructor syntax (ROW(...)) so that list elements foo.* will be expanded to a list of their member fields, rather than creating a nested rowtype field as formerly. (The old behavior is still available by omitting '.*'.) This syntax is not allowed by the SQL spec AFAICS, so changing its behavior doesn't violate the spec. The new behavior is substantially more useful since it allows, for example, triggers to check for data changes with 'if row(new.*) is distinct from row(old.*)'. Per my recent proposal.
2006-06-26 19:24:41 +02:00
extern List *ExpandColumnRefStar(ParseState *pstate, ColumnRef *cref,
bool targetlist);
extern List *ExpandIndirectionStar(ParseState *pstate, A_Indirection *ind,
bool targetlist);
Rewrite parser's handling of INSERT ... SELECT so that processing of the SELECT part of the statement is just like a plain SELECT. All INSERT-specific processing happens after the SELECT parsing is done. This eliminates many problems, e.g. INSERT ... SELECT ... GROUP BY using the wrong column labels. Ensure that DEFAULT clauses are coerced to the target column type, whether or not stored clause produces the right type. Substantial cleanup of parser's array support.
1999-07-19 02:26:20 +02:00
extern void updateTargetListEntry(ParseState *pstate, TargetEntry *tle,
Ye-old pgindent run. Same 4-space tabs.
2000-04-12 19:17:23 +02:00
char *colname, int attrno,
Add error location info to ResTarget parse nodes. Allows error cursor to be supplied for various mistakes involving INSERT and UPDATE target columns.
2006-03-23 01:19:30 +01:00
List *indirection,
int location);
Eliminate local inefficiencies in updateTargetListEntry, make_var, and make_const --- don't repeat cache searches that aren't needed.
1999-11-01 06:06:21 +01:00
extern List *checkInsertTargets(ParseState *pstate, List *cols,
Ye-old pgindent run. Same 4-space tabs.
2000-04-12 19:17:23 +02:00
List **attrnos);
ParseComplexProjection should make use of expandRecordVariable so that it can handle cases like (foo.x).y where foo is a subquery and x is a function-returning-RECORD RTE in that subquery.
2005-05-31 03:03:23 +02:00
extern TupleDesc expandRecordVariable(ParseState *pstate, Var *var,
Standard pgindent run for 8.1.
2005-10-15 04:49:52 +02:00
int levelsup);
Come to think of it, functions in FROM have the same syntactic restriction as CREATE INDEX did, and can be fixed the same way, for another small improvement in usability and reduction in grammar size.
2004-09-30 02:24:27 +02:00
extern char *FigureColname(Node *node);
Another pgindent run. Fixes enum indenting, and improves #endif spacing. Also adds space for one-line comments.
2001-10-28 07:26:15 +01:00
New pgindent run with fixes suggested by Tom. Patch manually reviewed, initdb/regression tests pass.
2001-11-05 18:46:40 +01:00
#endif /* PARSE_TARGET_H */