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postgresql/src/backend/parser
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Tom Lane a916b47e23 Clean up usage of bison precedence for non-operator keywords. 
Assigning a precedence to a keyword that isn't a kind of expression
operator is rather dangerous, because it might mask grammar
ambiguities that we'd rather know about.  It's much safer to attach
explicit precedences to individual rules, which will affect the
behavior of only that one rule.  Moreover, when we do have to give
a precedence to a non-operator keyword, we should try to give it the
same precedence as IDENT, thereby reducing the risk of surprising
side-effects.

Apply this hard-won knowledge to SET (which I misassigned ages ago
in commit 2647ad658) and some SQL/JSON-related productions
(from commits 6ee30209a, 71bfd1543).

Patch HEAD only, since there's no evidence of actual bugs here.

Discussion: https://postgr.es/m/CADT4RqBPdbsZW7HS1jJP319TMRHs1hzUiP=iRJYR6UqgHCrgNQ@mail.gmail.com
 		2023-11-28 13:32:15 -05:00
..
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
Makefile Remove distprep 2023-11-06 15:18:04 +01:00
README Remove outdated reference to a removed file 2023-06-15 22:35:42 +09:00
analyze.c Avoid unnecessary plancache revalidation of utility statements. 2023-08-24 12:02:46 -04:00
check_keywords.pl Pre-beta mechanical code beautification. 2023-05-19 17:24:48 -04:00
gram.y Clean up usage of bison precedence for non-operator keywords. 2023-11-28 13:32:15 -05:00
gramparse.h Update copyright for 2023 2023-01-02 15:00:37 -05:00
meson.build Update copyright for 2023 2023-01-02 15:00:37 -05:00
parse_agg.c Compute aggregate argument types correctly in transformAggregateCall(). 2023-11-06 10:38:00 -05:00
parse_clause.c Add missing initializations of p_perminfo 2023-07-14 14:56:35 +09:00
parse_coerce.c Make Vars be outer-join-aware. 2023-01-30 13:16:20 -05:00
parse_collate.c Add trailing commas to enum definitions 2023-10-26 09:20:54 +02:00
parse_cte.c Add trailing commas to enum definitions 2023-10-26 09:20:54 +02:00
parse_enr.c Update copyright for 2023 2023-01-02 15:00:37 -05:00
parse_expr.c Fix translation markers 2023-08-24 10:25:51 +02:00
parse_func.c Add trailing commas to enum definitions 2023-10-26 09:20:54 +02:00
parse_merge.c Pre-beta mechanical code beautification. 2023-05-19 17:24:48 -04:00
parse_node.c Allow underscores in integer and numeric constants. 2023-02-04 09:48:51 +00:00
parse_oper.c Extend ALTER OPERATOR to allow setting more optimization attributes. 2023-10-20 12:28:46 -04:00
parse_param.c Update copyright for 2023 2023-01-02 15:00:37 -05:00
parse_relation.c Add missing initializations of p_perminfo 2023-07-14 14:56:35 +09:00
parse_target.c Track nesting depth correctly when drilling down into RECORD Vars. 2023-09-15 17:01:52 -04:00
parse_type.c Handle \v as a whitespace character in parsers 2023-07-06 08:16:24 +09:00
parse_utilcmd.c Add TupleDescGetDefault() 2023-09-27 18:52:40 +01:00
parser.c Code review for recent SQL/JSON commits 2023-04-04 14:04:30 +02:00
scan.l Handle \v as a whitespace character in parsers 2023-07-06 08:16:24 +09:00
scansup.c Handle \v as a whitespace character in parsers 2023-07-06 08:16:24 +09:00

README 

src/backend/parser/README

Parser
======

This directory does more than tokenize and parse SQL queries.  It also
creates Query structures for the various complex queries that are passed
to the optimizer and then executor.

parser.c	things start here
scan.l		break query into tokens
scansup.c	handle escapes in input strings
gram.y		parse the tokens and produce a "raw" parse tree
analyze.c	top level of parse analysis for optimizable queries
parse_agg.c	handle aggregates, like SUM(col1),  AVG(col2), ...
parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
parse_coerce.c	handle coercing expressions to different data types
parse_collate.c	assign collation information in completed expressions
parse_cte.c	handle Common Table Expressions (WITH clauses)
parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
parse_enr.c	handle ephemeral named rels (trigger transition tables, ...)
parse_func.c	handle functions, table.column and column identifiers
parse_merge.c	handle MERGE
parse_node.c	create nodes for various structures
parse_oper.c	handle operators in expressions
parse_param.c	handle Params (for the cases used in the core backend)
parse_relation.c support routines for tables and column handling
parse_target.c	handle the result list of the query
parse_type.c	support routines for data type handling
parse_utilcmd.c	parse analysis for utility commands (done at execution time)

See also src/common/keywords.c, which contains the table of standard
keywords and the keyword lookup function.  We separated that out because
various frontend code wants to use it too.