diff options
Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index 8c536a8d38d..ccb5123e2ec 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -820,11 +820,12 @@ typedef struct CoerceViaIO * 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. * ---------------- */ @@ -832,11 +833,10 @@ typedef struct ArrayCoerceExpr { 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; |