rdelaage
/
postgresql
mirror of https://git.postgresql.org/git/postgresql.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
postgresql/src/backend/parser
History
Tom Lane 965a3d6be0 Fix realfailN lexer rules to not make assumptions about input format. 
The realfail1 and realfail2 backup-prevention rules always returned
token type FCONST, ignoring the possibility that what we've scanned
is more appropriately described as ICONST.  I think that at the
time that code was added, it might actually have been safe to not
distinguish; but since we started allowing AS-less aliases in SELECT
target lists, it's definitely legal to have a number immediately
followed by an identifier.

In the SELECT case, it seems there's no visible consequence because
make_const() will change the type back to integer anyway.  But I'm
worried that there are other contexts, or will be in future, where
it's more important to get the constant's type right.

Hence, use process_integer_literal to correctly determine which
token type to return.

Arguably this is a bug fix, but given the lack of evidence of
user-visible problems, I'll refrain from back-patching.

Discussion: https://postgr.es/m/21364.1542136808@sss.pgh.pa.us
 		2018-11-13 14:54:41 -05:00
..
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
Makefile Revert MERGE patch 2018-04-12 11:22:56 +01:00
README Move keywords.c/kwlookup.c into src/common/. 2016-03-23 20:22:08 -04:00
analyze.c Create an RTE field to record the query's lock mode for each relation. 2018-09-30 13:55:51 -04:00
check_keywords.pl Don't fall off the end of perl functions 2018-05-27 09:08:42 -04:00
gram.y Revise attribute handling code on partition creation 2018-11-08 16:22:09 -03:00
parse_agg.c Revert MERGE patch 2018-04-12 11:22:56 +01:00
parse_clause.c Create an RTE field to record the query's lock mode for each relation. 2018-09-30 13:55:51 -04:00
parse_coerce.c Fix interaction of CASE and ArrayCoerceExpr. 2018-10-30 15:26:11 -04:00
parse_collate.c Revert MERGE patch 2018-04-12 11:22:56 +01:00
parse_cte.c Update copyright for 2018 2018-01-02 23:30:12 -05:00
parse_enr.c Update copyright for 2018 2018-01-02 23:30:12 -05:00
parse_expr.c Revert MERGE patch 2018-04-12 11:22:56 +01:00
parse_func.c Fix misc typos, mostly in comments. 2018-07-18 16:17:32 +03:00
parse_node.c Update copyright for 2018 2018-01-02 23:30:12 -05:00
parse_oper.c Update copyright for 2018 2018-01-02 23:30:12 -05:00
parse_param.c Update copyright for 2018 2018-01-02 23:30:12 -05:00
parse_relation.c Correct constness of system attributes in heap.c & prerequisites. 2018-10-16 09:44:43 -07:00
parse_target.c Fix interaction of CASE and ArrayCoerceExpr. 2018-10-30 15:26:11 -04:00
parse_type.c Update copyright for 2018 2018-01-02 23:30:12 -05:00
parse_utilcmd.c Revise attribute handling code on partition creation 2018-11-08 16:22:09 -03:00
parser.c Update copyright for 2018 2018-01-02 23:30:12 -05:00
scan.l Fix realfailN lexer rules to not make assumptions about input format. 2018-11-13 14:54:41 -05:00
scansup.c Update copyright for 2018 2018-01-02 23:30:12 -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.