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postgresql/src/backend/parser
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Tom Lane d4382c4ae7 Extend EXPLAIN to allow generic options to be specified. 
The original syntax made it difficult to add options without making them
into reserved words.  This change parenthesizes the options to avoid that
problem, and makes provision for an explicit (and perhaps non-Boolean)
value for each option.  The original syntax is still supported, but only
for the two original options ANALYZE and VERBOSE.

As a test case, add a COSTS option that can suppress the planner cost
estimates.  This may be useful for including EXPLAIN output in the regression
tests, which are otherwise unable to cope with cross-platform variations in
cost estimates.

Robert Haas
 		2009-07-26 23:34:18 +00:00
..
.cvsignore Remove all traces that suggest that a non-Bison yacc might be supported, and 2008-08-29 13:02:33 +00:00
Makefile Separate the key word list that lived in keywords.c into a new header file 2009-03-07 00:13:58 +00:00
README Small wording improvements for source code READMEs. 2008-04-09 01:00:46 +00:00
analyze.c 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
gram.y Extend EXPLAIN to allow generic options to be specified. 2009-07-26 23:34:18 +00:00
keywords.c Tweak the core scanner so that it can be used by plpgsql too. 2009-07-14 20:24:10 +00:00
kwlookup.c Tweak the core scanner so that it can be used by plpgsql too. 2009-07-14 20:24:10 +00:00
parse_agg.c 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
parse_clause.c Make backend header files C++ safe 2009-07-16 06:33:46 +00:00
parse_coerce.c 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
parse_cte.c 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
parse_expr.c Make backend header files C++ safe 2009-07-16 06:33:46 +00:00
parse_func.c 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
parse_node.c 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
parse_oper.c Fix get_sort_group_operators() so that it doesn't think arrays can be grouped 2009-06-13 15:42:09 +00:00
parse_relation.c Make backend header files C++ safe 2009-07-16 06:33:46 +00:00
parse_target.c Make backend header files C++ safe 2009-07-16 06:33:46 +00:00
parse_type.c Make backend header files C++ safe 2009-07-16 06:33:46 +00:00
parse_utilcmd.c Make backend header files C++ safe 2009-07-16 06:33:46 +00:00
parser.c Tweak the core scanner so that it can be used by plpgsql too. 2009-07-14 20:24:10 +00:00
scan.l Tweak the core scanner so that it can be used by plpgsql too. 2009-07-14 20:24:10 +00:00
scansup.c Update copyright for 2009. 2009-01-01 17:24:05 +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)