* are very useful for debugging and interpreting completed plans, so we keep
* them around.
*/
-#define INNER_VAR 65000 /* reference to inner subplan */
-#define OUTER_VAR 65001 /* reference to outer subplan */
-#define INDEX_VAR 65002 /* reference to index column */
+#define INNER_VAR 65000 /* reference to inner subplan */
+#define OUTER_VAR 65001 /* reference to outer subplan */
+#define INDEX_VAR 65002 /* reference to index column */
#define IS_SPECIAL_VARNO(varno) ((varno) >= INNER_VAR)
Index varno; /* index of this var's relation in the range
* table, or INNER_VAR/OUTER_VAR/INDEX_VAR */
AttrNumber varattno; /* attribute number of this var, or zero for
- * all */
+ * all attrs ("whole-row Var") */
Oid vartype; /* pg_type OID for the type of this var */
int32 vartypmod; /* pg_attribute typmod value */
Oid varcollid; /* OID of collation, or InvalidOid if none */
Oid refelemtype; /* type of the array elements */
int32 reftypmod; /* typmod of the array (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
- List *refupperindexpr;/* expressions that evaluate to upper array
- * indexes */
- List *reflowerindexpr;/* expressions that evaluate to lower array
- * indexes, or NIL for single array element */
+ List *refupperindexpr; /* expressions that evaluate to upper
+ * array indexes */
+ List *reflowerindexpr; /* expressions that evaluate to lower
+ * array indexes, or NIL for single array
+ * element */
Expr *refexpr; /* the expression that evaluates to an array
* value */
Expr *refassgnexpr; /* expression for the source value, or NULL if
/* Extra data useful for determining subplan's output type: */
Oid firstColType; /* Type of first column of subplan result */
int32 firstColTypmod; /* Typmod of first column of subplan result */
- Oid firstColCollation; /* Collation of first column of
- * subplan result */
+ Oid firstColCollation; /* Collation of first column of subplan
+ * result */
/* Information about execution strategy: */
bool useHashTable; /* TRUE to store subselect output in a hash
* table (implies we are doing "IN") */
* the assign case of ArrayRef, this is used to implement UPDATE of a
* portion of a column.
*
+ * resulttype is always a named composite type (not a domain). To update
+ * a composite domain value, apply CoerceToDomain to the FieldStore.
+ *
* A single FieldStore can actually represent updates of several different
* fields. The parser only generates FieldStores with single-element lists,
* but the planner will collapse multiple updates of the same base column
* ArrayCoerceExpr
*
* ArrayCoerceExpr represents a type coercion from one array type to another,
- * which is implemented by applying the indicated element-type coercion
- * function to each element of the source array. If elemfuncid is InvalidOid
- * then the element types are binary-compatible, but the coercion still
- * requires some effort (we have to fix the element type ID stored in the
- * array header).
+ * which is implemented by applying the per-element coercion expression
+ * "elemexpr" to each element of the source array. Within elemexpr, the
+ * source element is represented by a CaseTestExpr node. Note that even if
+ * elemexpr is a no-op (that is, just CaseTestExpr + RelabelType), the
+ * coercion still requires some effort: we have to fix the element type OID
+ * stored in the array header.
* ----------------
*/
{
Expr xpr;
Expr *arg; /* input expression (yields an array) */
- Oid elemfuncid; /* OID of element coercion function, or 0 */
+ Expr *elemexpr; /* expression representing per-element work */
Oid resulttype; /* output type of coercion (an array type) */
int32 resulttypmod; /* output typmod (also element typmod) */
Oid resultcollid; /* OID of collation, or InvalidOid if none */
- bool isExplicit; /* conversion semantics flag to pass to func */
CoercionForm coerceformat; /* how to display this node */
int location; /* token location, or -1 if unknown */
} ArrayCoerceExpr;
* needed for the destination type plus possibly others; the columns need not
* be in the same positions, but are matched up by name. This is primarily
* used to convert a whole-row value of an inheritance child table into a
- * valid whole-row value of its parent table's rowtype.
+ * valid whole-row value of its parent table's rowtype. Both resulttype
+ * and the exposed type of "arg" must be named composite types (not domains).
* ----------------
*/
Oid row_typeid; /* RECORDOID or a composite type's ID */
/*
+ * row_typeid cannot be a domain over composite, only plain composite. To
+ * create a composite domain value, apply CoerceToDomain to the RowExpr.
+ *
* Note: we deliberately do NOT store a typmod. Although a typmod will be
* associated with specific RECORD types at runtime, it will differ for
* different backends, and so cannot safely be stored in stored
int cursor_param; /* refcursor parameter number, or 0 */
} CurrentOfExpr;
+/*
+ * NextValueExpr - get next value from sequence
+ *
+ * This has the same effect as calling the nextval() function, but it does not
+ * check permissions on the sequence. This is used for identity columns,
+ * where the sequence is an implicit dependency without its own permissions.
+ */
+typedef struct NextValueExpr
+{
+ Expr xpr;
+ Oid seqid;
+ Oid typeId;
+} NextValueExpr;
+
/*
* InferenceElem - an element of a unique index inference specification
*
Oid inferopclass; /* OID of att opclass, or InvalidOid */
} InferenceElem;
-/*
- * NextValueExpr - get next value from sequence
- *
- * This has the same effect as calling the nextval() function, but it does not
- * check permissions on the sequence. This is used for identity columns,
- * where the sequence is an implicit dependency without its own permissions.
- */
-typedef struct NextValueExpr
-{
- Expr xpr;
- Oid seqid;
- Oid typeId;
-} NextValueExpr;
-
/*--------------------
* TargetEntry -
* a target entry (used in query target lists)
Expr *expr; /* expression to evaluate */
AttrNumber resno; /* attribute number (see notes above) */
char *resname; /* name of the column (could be NULL) */
- Index ressortgroupref;/* nonzero if referenced by a sort/group
- * clause */
+ Index ressortgroupref; /* nonzero if referenced by a sort/group
+ * clause */
Oid resorigtbl; /* OID of column's source table */
AttrNumber resorigcol; /* column's number in source table */
bool resjunk; /* set to true to eliminate the attribute from
List *exclRelTlist; /* tlist of the EXCLUDED pseudo relation */
} OnConflictExpr;
-#endif /* PRIMNODES_H */
+#endif /* PRIMNODES_H */
projects / postgresql / blobdiff