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Diffstat (limited to 'src/backend/parser/README')
| -rw-r--r-- | src/backend/parser/README | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/backend/parser/README b/src/backend/parser/README new file mode 100644 index 0000000..6d8f19b --- /dev/null +++ b/src/backend/parser/README @@ -0,0 +1,32 @@ +src/backend/parser/README + +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 +gram.y parse the tokens and produce a "raw" parse tree +analyze.c top level of parse analysis for optimizable queries +parse_agg.c handle aggregates, like SUM(col1), AVG(col2), ... +parse_clause.c handle clauses like WHERE, ORDER BY, GROUP BY, ... +parse_coerce.c handle coercing expressions to different data types +parse_collate.c assign collation information in completed expressions +parse_cte.c handle Common Table Expressions (WITH clauses) +parse_expr.c handle expressions like col, col + 3, x = 3 or x = 4 +parse_func.c handle functions, table.column and column identifiers +parse_node.c create nodes for various structures +parse_oper.c handle operators in expressions +parse_param.c handle Params (for the cases used in the core backend) +parse_relation.c support routines for tables and column handling +parse_target.c handle the result list of the query +parse_type.c support routines for data type handling +parse_utilcmd.c parse analysis for utility commands (done at execution time) + +See also src/common/keywords.c, which contains the table of standard +keywords and the keyword lookup function. We separated that out because +various frontend code wants to use it too. |