Fix validation of COPY FORCE_NOT_NULL/FORCE_NULL for the all-column cases

This commit adds missing checks for COPY FORCE_NOT_NULL and FORCE_NULL
when applied to all columns via "*".  These options now correctly
require CSV mode and are disallowed in COPY TO, making their behavior
consistent with FORCE_QUOTE.

Some regression tests are added to verify the correct behavior for the
all-columns case, including FORCE_QUOTE, which was not tested.

Backpatch down to 17, where support for the all-column grammar with
FORCE_NOT_NULL and FORCE_NULL has been added.

Author: Joel Jacobson
Reviewed-by: Zhang Mingli
Discussion: https://postgr.es/m/65030d1d-5f90-4fa4-92eb-f5f50389858e@app.fastmail.com
Backpatch-through: 17

Author: michaelpq

src/backend/commands/copy.c

@@ -805,12 +805,14 @@ ProcessCopyOptions(ParseState *pstate,
 						"COPY FROM")));
 
 	/* Check force_notnull */
-	if (!opts_out->csv_mode && opts_out->force_notnull != NIL)
+	if (!opts_out->csv_mode && (opts_out->force_notnull != NIL ||
+								opts_out->force_notnull_all))
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 		/*- translator: %s is the name of a COPY option, e.g. ON_ERROR */
 				 errmsg("COPY %s requires CSV mode", "FORCE_NOT_NULL")));
-	if (opts_out->force_notnull != NIL && !is_from)
+	if ((opts_out->force_notnull != NIL || opts_out->force_notnull_all) &&
+		!is_from)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 		/*- translator: first %s is the name of a COPY option, e.g. ON_ERROR,
@@ -819,13 +821,15 @@ ProcessCopyOptions(ParseState *pstate,
 						"COPY TO")));
 
 	/* Check force_null */
-	if (!opts_out->csv_mode && opts_out->force_null != NIL)
+	if (!opts_out->csv_mode && (opts_out->force_null != NIL ||
+								opts_out->force_null_all))
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 		/*- translator: %s is the name of a COPY option, e.g. ON_ERROR */
 				 errmsg("COPY %s requires CSV mode", "FORCE_NULL")));
 
-	if (opts_out->force_null != NIL && !is_from)
+	if ((opts_out->force_null != NIL || opts_out->force_null_all) &&
+		!is_from)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 		/*- translator: first %s is the name of a COPY option, e.g. ON_ERROR,

src/test/regress/expected/copy2.out

@@ -98,16 +98,28 @@ LINE 1: COPY x from stdin (on_error unsupported);
                            ^
 COPY x from stdin (format TEXT, force_quote(a));
 ERROR:  COPY FORCE_QUOTE requires CSV mode
+COPY x from stdin (format TEXT, force_quote *);
+ERROR:  COPY FORCE_QUOTE requires CSV mode
 COPY x from stdin (format CSV, force_quote(a));
 ERROR:  COPY FORCE_QUOTE cannot be used with COPY FROM
+COPY x from stdin (format CSV, force_quote *);
+ERROR:  COPY FORCE_QUOTE cannot be used with COPY FROM
 COPY x from stdin (format TEXT, force_not_null(a));
 ERROR:  COPY FORCE_NOT_NULL requires CSV mode
+COPY x from stdin (format TEXT, force_not_null *);
+ERROR:  COPY FORCE_NOT_NULL requires CSV mode
 COPY x to stdout (format CSV, force_not_null(a));
 ERROR:  COPY FORCE_NOT_NULL cannot be used with COPY TO
+COPY x to stdout (format CSV, force_not_null *);
+ERROR:  COPY FORCE_NOT_NULL cannot be used with COPY TO
 COPY x from stdin (format TEXT, force_null(a));
 ERROR:  COPY FORCE_NULL requires CSV mode
+COPY x from stdin (format TEXT, force_null *);
+ERROR:  COPY FORCE_NULL requires CSV mode
 COPY x to stdout (format CSV, force_null(a));
 ERROR:  COPY FORCE_NULL cannot be used with COPY TO
+COPY x to stdout (format CSV, force_null *);
+ERROR:  COPY FORCE_NULL cannot be used with COPY TO
 COPY x to stdout (format BINARY, on_error unsupported);
 ERROR:  COPY ON_ERROR cannot be used with COPY TO
 LINE 1: COPY x to stdout (format BINARY, on_error unsupported);

src/test/regress/sql/copy2.sql

@@ -75,11 +75,17 @@ COPY x from stdin (format BINARY, null 'x');
 COPY x from stdin (format BINARY, on_error ignore);
 COPY x from stdin (on_error unsupported);
 COPY x from stdin (format TEXT, force_quote(a));
+COPY x from stdin (format TEXT, force_quote *);
 COPY x from stdin (format CSV, force_quote(a));
+COPY x from stdin (format CSV, force_quote *);
 COPY x from stdin (format TEXT, force_not_null(a));
+COPY x from stdin (format TEXT, force_not_null *);
 COPY x to stdout (format CSV, force_not_null(a));
+COPY x to stdout (format CSV, force_not_null *);
 COPY x from stdin (format TEXT, force_null(a));
+COPY x from stdin (format TEXT, force_null *);
 COPY x to stdout (format CSV, force_null(a));
+COPY x to stdout (format CSV, force_null *);
 COPY x to stdout (format BINARY, on_error unsupported);
 COPY x from stdin (log_verbosity unsupported);
 COPY x from stdin with (reject_limit 1);