Remove code handling FORCE_NULL and FORCE_NOT_NULL for COPY TO

These two options are only available with COPY FROM, so the extra logic
in charge of checking the validity of the attributes given has no
purpose.

Author: Zhang Mingli
Reviewed-by: Richard Guo, Kyotaro Horiguchi
Discussion: https://postgr.es/m/F28F0B5A-766F-4D33-BF44-43B3A052D833@gmail.com

diff --git a/src/backend/commands/copyto.c b/src/backend/commands/copyto.c
index 2527e6605988eb40bd909e083a0208ac1e65a9c8..f26cc0d162f171a6dde12ed82ede882bd46baeb5 100644 (file)
--- a/src/backend/commands/copyto.c
+++ b/src/backend/commands/copyto.c
@@ -608,52 +608,6 @@ BeginCopyTo(ParseState *pstate,
                }
        }
 
-       /* Convert FORCE_NOT_NULL name list to per-column flags, check validity */
-       cstate->opts.force_notnull_flags = (bool *) palloc0(num_phys_attrs * sizeof(bool));
-       if (cstate->opts.force_notnull)
-       {
-               List       *attnums;
-               ListCell   *cur;
-
-               attnums = CopyGetAttnums(tupDesc, cstate->rel, cstate->opts.force_notnull);
-
-               foreach(cur, attnums)
-               {
-                       int                     attnum = lfirst_int(cur);
-                       Form_pg_attribute attr = TupleDescAttr(tupDesc, attnum - 1);
-
-                       if (!list_member_int(cstate->attnumlist, attnum))
-                               ereport(ERROR,
-                                               (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
-                                                errmsg("FORCE_NOT_NULL column \"%s\" not referenced by COPY",
-                                                               NameStr(attr->attname))));
-                       cstate->opts.force_notnull_flags[attnum - 1] = true;
-               }
-       }
-
-       /* Convert FORCE_NULL name list to per-column flags, check validity */
-       cstate->opts.force_null_flags = (bool *) palloc0(num_phys_attrs * sizeof(bool));
-       if (cstate->opts.force_null)
-       {
-               List       *attnums;
-               ListCell   *cur;
-
-               attnums = CopyGetAttnums(tupDesc, cstate->rel, cstate->opts.force_null);
-
-               foreach(cur, attnums)
-               {
-                       int                     attnum = lfirst_int(cur);
-                       Form_pg_attribute attr = TupleDescAttr(tupDesc, attnum - 1);
-
-                       if (!list_member_int(cstate->attnumlist, attnum))
-                               ereport(ERROR,
-                                               (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
-                                                errmsg("FORCE_NULL column \"%s\" not referenced by COPY",
-                                                               NameStr(attr->attname))));
-                       cstate->opts.force_null_flags[attnum - 1] = true;
-               }
-       }
-
        /* Use client encoding when ENCODING option is not specified. */
        if (cstate->opts.file_encoding < 0)
                cstate->file_encoding = pg_get_client_encoding();