diff options
Diffstat (limited to 'src/include/parser/parse_node.h')
| -rw-r--r-- | src/include/parser/parse_node.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h index 200b9744e51..e3bb35f1308 100644 --- a/src/include/parser/parse_node.h +++ b/src/include/parser/parse_node.h @@ -19,6 +19,54 @@ /* + * Expression kinds distinguished by transformExpr(). Many of these are not + * semantically distinct so far as expression transformation goes; rather, + * we distinguish them so that context-specific error messages can be printed. + * + * Note: EXPR_KIND_OTHER is not used in the core code, but is left for use + * by extension code that might need to call transformExpr(). The core code + * will not enforce any context-driven restrictions on EXPR_KIND_OTHER + * expressions, so the caller would have to check for sub-selects, aggregates, + * and window functions if those need to be disallowed. + */ +typedef enum ParseExprKind +{ + EXPR_KIND_NONE = 0, /* "not in an expression" */ + EXPR_KIND_OTHER, /* reserved for extensions */ + EXPR_KIND_JOIN_ON, /* JOIN ON */ + EXPR_KIND_JOIN_USING, /* JOIN USING */ + EXPR_KIND_FROM_SUBSELECT, /* sub-SELECT in FROM clause */ + EXPR_KIND_FROM_FUNCTION, /* function in FROM clause */ + EXPR_KIND_WHERE, /* WHERE */ + EXPR_KIND_HAVING, /* HAVING */ + EXPR_KIND_WINDOW_PARTITION, /* window definition PARTITION BY */ + EXPR_KIND_WINDOW_ORDER, /* window definition ORDER BY */ + EXPR_KIND_WINDOW_FRAME_RANGE, /* window frame clause with RANGE */ + EXPR_KIND_WINDOW_FRAME_ROWS, /* window frame clause with ROWS */ + EXPR_KIND_SELECT_TARGET, /* SELECT target list item */ + EXPR_KIND_INSERT_TARGET, /* INSERT target list item */ + EXPR_KIND_UPDATE_SOURCE, /* UPDATE assignment source item */ + EXPR_KIND_UPDATE_TARGET, /* UPDATE assignment target item */ + EXPR_KIND_GROUP_BY, /* GROUP BY */ + EXPR_KIND_ORDER_BY, /* ORDER BY */ + EXPR_KIND_DISTINCT_ON, /* DISTINCT ON */ + EXPR_KIND_LIMIT, /* LIMIT */ + EXPR_KIND_OFFSET, /* OFFSET */ + EXPR_KIND_RETURNING, /* RETURNING */ + EXPR_KIND_VALUES, /* VALUES */ + EXPR_KIND_CHECK_CONSTRAINT, /* CHECK constraint for a table */ + EXPR_KIND_DOMAIN_CHECK, /* CHECK constraint for a domain */ + EXPR_KIND_COLUMN_DEFAULT, /* default value for a table column */ + EXPR_KIND_FUNCTION_DEFAULT, /* default parameter value for function */ + EXPR_KIND_INDEX_EXPRESSION, /* index expression */ + EXPR_KIND_INDEX_PREDICATE, /* index predicate */ + EXPR_KIND_ALTER_COL_TRANSFORM, /* transform expr in ALTER COLUMN TYPE */ + EXPR_KIND_EXECUTE_PARAMETER, /* parameter value in EXECUTE */ + EXPR_KIND_TRIGGER_WHEN /* WHEN condition in CREATE TRIGGER */ +} ParseExprKind; + + +/* * Function signatures for parser hooks */ typedef struct ParseState ParseState; @@ -93,6 +141,7 @@ struct ParseState List *p_future_ctes; /* common table exprs not yet in namespace */ CommonTableExpr *p_parent_cte; /* this query's containing CTE */ List *p_windowdefs; /* raw representations of window clauses */ + ParseExprKind p_expr_kind; /* what kind of expression we're parsing */ int p_next_resno; /* next targetlist resno to assign */ List *p_locking_clause; /* raw FOR UPDATE/FOR SHARE info */ Node *p_value_substitute; /* what to replace VALUE with, if any */ |