diff options
Diffstat (limited to 'src/include/nodes/parsenodes.h')
| -rw-r--r-- | src/include/nodes/parsenodes.h | 59 |
1 files changed, 28 insertions, 31 deletions
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h index b336ff9c6ab..151c93a078e 100644 --- a/src/include/nodes/parsenodes.h +++ b/src/include/nodes/parsenodes.h @@ -338,26 +338,6 @@ typedef struct FuncCall } FuncCall; /* - * TableSampleClause - a sampling method information - */ -typedef struct TableSampleClause -{ - NodeTag type; - Oid tsmid; - bool tsmseqscan; - bool tsmpagemode; - Oid tsminit; - Oid tsmnextblock; - Oid tsmnexttuple; - Oid tsmexaminetuple; - Oid tsmend; - Oid tsmreset; - Oid tsmcost; - Node *repeatable; - List *args; -} TableSampleClause; - -/* * A_Star - '*' representing all columns of a table or compound field * * This can appear within ColumnRef.fields, A_Indirection.indirection, and @@ -558,19 +538,23 @@ typedef struct RangeFunction } RangeFunction; /* - * RangeTableSample - represents <table> TABLESAMPLE <method> (<params>) REPEATABLE (<num>) + * RangeTableSample - TABLESAMPLE appearing in a raw FROM clause * - * SQL Standard specifies only one parameter which is percentage. But we allow - * custom tablesample methods which may need different input arguments so we - * accept list of arguments. + * This node, appearing only in raw parse trees, represents + * <relation> TABLESAMPLE <method> (<params>) REPEATABLE (<num>) + * Currently, the <relation> can only be a RangeVar, but we might in future + * allow RangeSubselect and other options. Note that the RangeTableSample + * is wrapped around the node representing the <relation>, rather than being + * a subfield of it. */ typedef struct RangeTableSample { NodeTag type; - RangeVar *relation; - char *method; /* sampling method */ - Node *repeatable; - List *args; /* arguments for sampling method */ + Node *relation; /* relation to be sampled */ + List *method; /* sampling method name (possibly qualified) */ + List *args; /* argument(s) for sampling method */ + Node *repeatable; /* REPEATABLE expression, or NULL if none */ + int location; /* method name location, or -1 if unknown */ } RangeTableSample; /* @@ -810,7 +794,7 @@ typedef struct RangeTblEntry */ Oid relid; /* OID of the relation */ char relkind; /* relation kind (see pg_class.relkind) */ - TableSampleClause *tablesample; /* sampling method and parameters */ + struct TableSampleClause *tablesample; /* sampling info, or NULL */ /* * Fields valid for a subquery RTE (else NULL): @@ -913,6 +897,19 @@ typedef struct RangeTblFunction } RangeTblFunction; /* + * TableSampleClause - TABLESAMPLE appearing in a transformed FROM clause + * + * Unlike RangeTableSample, this is a subnode of the relevant RangeTblEntry. + */ +typedef struct TableSampleClause +{ + NodeTag type; + Oid tsmhandler; /* OID of the tablesample handler function */ + List *args; /* tablesample argument expression(s) */ + Expr *repeatable; /* REPEATABLE expression, or NULL if none */ +} TableSampleClause; + +/* * WithCheckOption - * representation of WITH CHECK OPTION checks to be applied to new tuples * when inserting/updating an auto-updatable view, or RLS WITH CHECK @@ -2520,7 +2517,7 @@ typedef struct RenameStmt typedef struct AlterObjectSchemaStmt { NodeTag type; - ObjectType objectType; /* OBJECT_TABLE, OBJECT_TYPE, etc */ + ObjectType objectType; /* OBJECT_TABLE, OBJECT_TYPE, etc */ RangeVar *relation; /* in case it's a table */ List *object; /* in case it's some other object */ List *objarg; /* argument types, if applicable */ @@ -2535,7 +2532,7 @@ typedef struct AlterObjectSchemaStmt typedef struct AlterOwnerStmt { NodeTag type; - ObjectType objectType; /* OBJECT_TABLE, OBJECT_TYPE, etc */ + ObjectType objectType; /* OBJECT_TABLE, OBJECT_TYPE, etc */ RangeVar *relation; /* in case it's a table */ List *object; /* in case it's some other object */ List *objarg; /* argument types, if applicable */ |