Test ALIGNOF_DOUBLE==4 compatibility under ALIGNOF_DOUBLE==8.

Today's test case detected alignment problems only when executing on
AIX.  This change lets popular platforms detect the same problems.

Reviewed by Masahiko Sawada.

Discussion: https://postgr.es/m/20220415072601.GG862547@rfd.leadboat.com

src/test/regress/expected/sanity_check.out

@@ -39,18 +39,18 @@ WITH check_columns AS (
    SELECT t.oid
     FROM pg_type t JOIN pg_attribute pa ON t.oid = pa.atttypid
     WHERE pa.attrelid = a.attrelid AND
-          pa.attnum > 0 AND pa.attnum <= a.attnum
+          pa.attnum > 0 AND pa.attnum < a.attnum
     ORDER BY pa.attnum) AS coltypes
  FROM pg_attribute a JOIN pg_class c ON c.oid = attrelid
   JOIN pg_namespace n ON c.relnamespace = n.oid
  WHERE attalign = 'd' AND relkind = 'r' AND
   attnotnull AND attlen <> -1 AND n.nspname = 'pg_catalog'
 )
-SELECT relname, attname, coltypes, get_column_offset(coltypes)
+SELECT relname, attname, coltypes, get_columns_length(coltypes)
  FROM check_columns
- WHERE get_column_offset(coltypes) % 8 != 0 OR
+ WHERE get_columns_length(coltypes) % 8 != 0 OR
        'name'::regtype::oid = ANY(coltypes);
- relname | attname | coltypes | get_column_offset 
----------+---------+----------+-------------------
+ relname | attname | coltypes | get_columns_length 
+---------+---------+----------+--------------------
 (0 rows)
 

src/test/regress/expected/test_setup.out

@@ -206,7 +206,7 @@ CREATE FUNCTION ttdummy ()
     RETURNS trigger
     AS :'regresslib'
     LANGUAGE C;
-CREATE FUNCTION get_column_offset (oid[])
+CREATE FUNCTION get_columns_length(oid[])
     RETURNS int
     AS :'regresslib'
     LANGUAGE C STRICT STABLE PARALLEL SAFE;

src/test/regress/regress.c

@@ -1219,12 +1219,12 @@ binary_coercible(PG_FUNCTION_ARGS)
 }
 
 /*
- * Return the column offset of the last data in the given array of
- * data types.  The input data types must be fixed-length data types.
+ * Return the length of the portion of a tuple consisting of the given array
+ * of data types.  The input data types must be fixed-length data types.
  */
-PG_FUNCTION_INFO_V1(get_column_offset);
+PG_FUNCTION_INFO_V1(get_columns_length);
 Datum
-get_column_offset(PG_FUNCTION_ARGS)
+get_columns_length(PG_FUNCTION_ARGS)
 {
 	ArrayType	*ta = PG_GETARG_ARRAYTYPE_P(0);
 	Oid			*type_oids;
@@ -1249,14 +1249,10 @@ get_column_offset(PG_FUNCTION_ARGS)
 		get_typlenbyvalalign(typeoid, &typlen, &typbyval, &typalign);
 
 		/* the data type must be fixed-length */
-		if (!(typbyval || (typlen > 0)))
+		if (typlen < 0)
 			elog(ERROR, "type %u is not fixed-length data type", typeoid);
 
-		column_offset = att_align_nominal(column_offset, typalign);
-
-		/* not include the last type size */
-		if (i != (ntypes - 1))
-			column_offset += typlen;
+		column_offset = att_align_nominal(column_offset + typlen, typalign);
 	}
 
 	PG_RETURN_INT32(column_offset);

src/test/regress/sql/sanity_check.sql

@@ -34,14 +34,14 @@ WITH check_columns AS (
    SELECT t.oid
     FROM pg_type t JOIN pg_attribute pa ON t.oid = pa.atttypid
     WHERE pa.attrelid = a.attrelid AND
-          pa.attnum > 0 AND pa.attnum <= a.attnum
+          pa.attnum > 0 AND pa.attnum < a.attnum
     ORDER BY pa.attnum) AS coltypes
  FROM pg_attribute a JOIN pg_class c ON c.oid = attrelid
   JOIN pg_namespace n ON c.relnamespace = n.oid
  WHERE attalign = 'd' AND relkind = 'r' AND
   attnotnull AND attlen <> -1 AND n.nspname = 'pg_catalog'
 )
-SELECT relname, attname, coltypes, get_column_offset(coltypes)
+SELECT relname, attname, coltypes, get_columns_length(coltypes)
  FROM check_columns
- WHERE get_column_offset(coltypes) % 8 != 0 OR
+ WHERE get_columns_length(coltypes) % 8 != 0 OR
        'name'::regtype::oid = ANY(coltypes);

src/test/regress/sql/test_setup.sql

@@ -253,7 +253,7 @@ CREATE FUNCTION ttdummy ()
     AS :'regresslib'
     LANGUAGE C;
 
-CREATE FUNCTION get_column_offset (oid[])
+CREATE FUNCTION get_columns_length(oid[])
     RETURNS int
     AS :'regresslib'
     LANGUAGE C STRICT STABLE PARALLEL SAFE;