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postgresql/src/backend/parser
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Tom Lane f52c5d6749 Forbid marking an identity column as nullable. 
GENERATED ALWAYS AS IDENTITY implies NOT NULL, but the code failed
to complain if you overrode that with "GENERATED ALWAYS AS IDENTITY
NULL".  One might think the old behavior was a feature, but it was
inconsistent because the outcome varied depending on the order of
the clauses, so it seems to have been just an oversight.

Per bug #16913 from Pavel Boev.  Back-patch to v10 where identity
columns were introduced.

Vik Fearing (minor tweaks by me)

Discussion: https://postgr.es/m/16913-3b5198410f67d8c6@postgresql.org
 		2021-03-12 11:08:42 -05:00
..
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
Makefile Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
README Move keywords.c/kwlookup.c into src/common/. 2016-03-23 20:22:08 -04:00
analyze.c SEARCH and CYCLE clauses 2021-02-01 14:32:51 +01:00
check_keywords.pl Update copyright for 2021 2021-01-02 13:06:25 -05:00
gram.y Enhanced cycle mark values 2021-02-27 08:13:24 +01:00
parse_agg.c SEARCH and CYCLE clauses 2021-02-01 14:32:51 +01:00
parse_clause.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_coerce.c Re-implement pl/pgsql's expression and assignment parsing. 2021-01-04 11:52:00 -05:00
parse_collate.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_cte.c Fix list-manipulation bug in WITH RECURSIVE processing. 2021-02-25 20:47:32 -05:00
parse_enr.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_expr.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_func.c SEARCH and CYCLE clauses 2021-02-01 14:32:51 +01:00
parse_node.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_oper.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_param.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_relation.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_target.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_type.c Add the ability for the core grammar to have more than one parse target. 2021-01-04 11:03:22 -05:00
parse_utilcmd.c Forbid marking an identity column as nullable. 2021-03-12 11:08:42 -05:00
parser.c Re-implement pl/pgsql's expression and assignment parsing. 2021-01-04 11:52:00 -05:00
scan.l Update copyright for 2021 2021-01-02 13:06:25 -05:00
scansup.c Update copyright for 2021 2021-01-02 13:06:25 -05:00

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_func.c	handle functions, table.column and column identifiers
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.