Re: How to Know the number of attrs?

On 2023-09-24 20:56 +0800, jacktby jacktby wrote:
> typedef struct TupleDescData
> {
> int natts; /* number of attributes in the tuple */
> Oid tdtypeid; /* composite type ID for tuple type */
> int32 tdtypmod; /* typmod for tuple type */
> int tdrefcount; /* reference count, or -1 if not counting */
> TupleConstr *constr; /* constraints, or NULL if none */
> /* attrs[N] is the description of Attribute Number N+1 */
> FormData_pg_attribute attrs[FLEXIBLE_ARRAY_MEMBER];
> } TupleDescData;
>
> Hi, the attrs use FLEXIBLE_ARRAY_MEMBER, so which API should I use to
> get the real length of this array?

Use the natts field of TupleDescData.

--
Erik