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| author | Bruce Momjian <bruce@momjian.us> | 1997-11-26 15:36:00 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 1997-11-26 15:36:00 +0000 |
| commit | bac80c218eea921941a6f56f65a611e852536b53 (patch) | |
| tree | 716b0049161943050c34ad164dba8ff4ac2afd8d | |
| parent | d79b9a1b7a451747241b3c7a31e25f00322bfa84 (diff) | |
| download | postgresql-bac80c218eea921941a6f56f65a611e852536b53.tar.gz postgresql-bac80c218eea921941a6f56f65a611e852536b53.zip | |
Add README for parser directory
| -rw-r--r-- | src/backend/parser/README | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/backend/parser/README b/src/backend/parser/README new file mode 100644 index 00000000000..ddbcb6f63d8 --- /dev/null +++ b/src/backend/parser/README @@ -0,0 +1,20 @@ +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 one function for every complex query type like SELECT, INSERT... +parse_clause.c handle clauses like WHERE, ORDER BY, GROUP BY, ... +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 like date_part(col3), trim(col4), ... + +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 |