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Tom Lane 46e9709f48 Remove transformAlterTableStmt's kluge to replace ColumnDef.is_not_null 
flags by separate AT_SetNotNull subcommands.  That was always ugly and
inefficient, and it's now clear that it was merely a partial workaround
for the bug just identified in ATExecAddColumn.  This is just code
beautification not a bug fix, so no back-patch.

Brendan Jurd, with some trivial additional cleanup by me.
 		2008-04-24 20:46:49 +00:00
..
.cvsignore Add .cvsignore file so cvs doesn't complain if you have lex/yacc 1999-03-21 02:43:58 +00:00
Makefile Refactor backend makefiles to remove lots of duplicate code 2008-02-19 10:30:09 +00:00
README Small wording improvements for source code READMEs. 2008-04-09 01:00:46 +00:00
analyze.c Update copyrights in source tree to 2008. 2008-01-01 19:46:01 +00:00
gram.y Push index operator lossiness determination down to GIST/GIN opclass 2008-04-14 17:05:34 +00:00
keywords.c Reduce the need for frontend programs to include "postgres.h" by refactoring 2008-03-27 03:57:34 +00:00
parse_agg.c Update copyrights in source tree to 2008. 2008-01-01 19:46:01 +00:00
parse_clause.c Remove ancient restriction that LIMIT/OFFSET can't contain a sub-select. 2008-02-15 17:19:46 +00:00
parse_coerce.c The original implementation of polymorphic aggregates didn't really get the 2008-01-11 18:39:41 +00:00
parse_expr.c Arrange for an explicit cast applied to an ARRAY[] constructor to be applied 2008-03-20 21:42:48 +00:00
parse_func.c Move the HTSU_Result enum definition into snapshot.h, to avoid including 2008-03-26 21:10:39 +00:00
parse_node.c Allow float8, int8, and related datatypes to be passed by value on machines 2008-04-21 00:26:47 +00:00
parse_oper.c Issue explicit error messages for attempts to use "shell" operators in 2008-04-22 01:34:34 +00:00
parse_relation.c Defend against JOINs having more than 32K columns altogether. We cannot 2008-04-05 01:58:20 +00:00
parse_target.c Arrange for an explicit cast applied to an ARRAY[] constructor to be applied 2008-03-20 21:42:48 +00:00
parse_type.c Add some debug support code to try to catch future mistakes in the area of 2008-04-11 22:54:23 +00:00
parse_utilcmd.c Remove transformAlterTableStmt's kluge to replace ColumnDef.is_not_null 2008-04-24 20:46:49 +00:00
parser.c Update copyrights in source tree to 2008. 2008-01-01 19:46:01 +00:00
scan.l Oops, change should go in scan.l to survive a clean checkout and not just 2008-04-04 12:44:36 +00:00
scansup.c Update copyrights in source tree to 2008. 2008-01-01 19:46:01 +00:00

README 

$PostgreSQL: pgsql/src/backend/parser/README,v 1.10 2008/04/09 01:00:46 momjian Exp $

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
keywords.c	turn keywords into specific tokens
gram.y		parse the tokens and fill query-type-specific structures
analyze.c	top level of parse analysis for optimizable queries
parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
parse_coerce.c	handle coercing expressions to different data types
parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
parse_oper.c	handle operators in expressions
parse_agg.c	handle aggregates, like SUM(col1),  AVG(col2), ...
parse_func.c	handle functions, table.column and column identifiers
parse_node.c	create nodes for various structures
parse_target.c	handle the result list of the query
parse_relation.c support routines for tables and column handling
parse_type.c	support routines for data type handling
parse_utilcmd.c	parse analysis for utility commands (done at execution time)