postgres

History

Tom Lane b26dfb9522 Extend pg_cast castimplicit column to a three-way value; this allows us to be flexible about assignment casts without introducing ambiguity in operator/function resolution. Introduce a well-defined promotion hierarchy for numeric datatypes (int2->int4->int8->numeric->float4->float8). Change make_const to initially label numeric literals as int4, int8, or numeric (never float8 anymore). Explicitly mark Func and RelabelType nodes to indicate whether they came from a function call, explicit cast, or implicit cast; use this to do reverse-listing more accurately and without so many heuristics. Explicit casts to char, varchar, bit, varbit will truncate or pad without raising an error (the pre-7.2 behavior), while assigning to a column without any explicit cast will still raise an error for wrong-length data like 7.3. This more nearly follows the SQL spec than 7.2 behavior (we should be reporting a 'completion condition' in the explicit-cast cases, but we have no mechanism for that, so just do silent truncation). Fix some problems with enforcement of typmod for array elements; it didn't work at all in 'UPDATE ... SET array[n] = foo', for example. Provide a generalized array_length_coerce() function to replace the specialized per-array-type functions that used to be needed (and were missing for NUMERIC as well as all the datetime types). Add missing conversions int8<->float4, text<->numeric, oid<->int8. initdb forced.		23 years ago
..
.cvsignore	Add .cvsignore file so cvs doesn't complain if you have lex/yacc	27 years ago
Makefile	Scanner performance improvements	24 years ago
README	cleanup	27 years ago
analyze.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
gram.y	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
keywords.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_agg.c	Update copyright to 2002.	24 years ago
parse_clause.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_coerce.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_expr.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_func.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_node.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_oper.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_relation.c	pgindent run.	23 years ago
parse_target.c	Extend pg_cast castimplicit column to a three-way value; this allows us	23 years ago
parse_type.c	pgindent run.	23 years ago
parser.c	pgindent run.	23 years ago
scan.l	Remove #ifdef MULTIBYTE per hackers list discussion.	23 years ago
scansup.c	Be careful to include postgres.h before any system headers, to ensure	23 years ago

README

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

parser.c	things start here
scan.l		break query into tokens
scansup.c	handle escapes in input
keywords.c	turn keywords into specific tokens
gram.y		parse the tokens and fill query-type-specific structures
analyze.c	handle post-parse processing for each query type
parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
parse_coerce.c	used for coercing expressions of different types
parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
parse_oper.c	handle operations 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 type handling