1 This directory does more than tokenize and parse SQL queries. It also
2 creates Query structures for the various complex queries that is passed
3 to the optimizer and then executor.
5 parser.c things start here
6 scan.l break query into tokens
7 scansup.c handle escapes in input
8 keywords.c turn keywords into specific tokens
9 gram.y parse the tokens and fill query-type-specific structures
10 analyze.c handle post-parse processing for each query type
11 parse_clause.c handle clauses like WHERE, ORDER BY, GROUP BY, ...
12 parse_coerce.c used for coercing expressions of different types
13 parse_expr.c handle expressions like col, col + 3, x = 3 or x = 4
14 parse_oper.c handle operations in expressions
15 parse_agg.c handle aggregates, like SUM(col1), AVG(col2), ...
16 parse_func.c handle functions, table.column and column identifiers
17 parse_node.c create nodes for various structures
18 parse_target.c handle the result list of the query
19 parse_relation.c support routines for tables and column handling
20 parse_type.c support routines for type handling