MDEV-14389: MyRocks and NOPAD collations

Disallow use of NOPAD collations in indexed columns.

sql/share/errmsg-utf8.txt

@@ -7749,3 +7749,7 @@ ER_NET_OK_PACKET_TOO_LARGE
 
 ER_GEOJSON_EMPTY_COORDINATES
         eng "Incorrect GeoJSON format - empty 'coordinates' array."
+
+ER_MYROCKS_CANT_NOPAD_COLLATION
+  eng "MyRocks doesn't currently support collations with \"No pad\" attribute."
+

storage/rocksdb/ha_rocksdb.cc

@@ -5964,6 +5964,19 @@ rdb_is_index_collation_supported(const my_core::Field *const field) {
   return true;
 }
 
+
+static bool
+rdb_field_uses_nopad_collation(const my_core::Field *const field) {
+  const my_core::enum_field_types type = field->real_type();
+  /* Handle [VAR](CHAR|BINARY) or TEXT|BLOB */
+  if (type == MYSQL_TYPE_VARCHAR || type == MYSQL_TYPE_STRING ||
+      type == MYSQL_TYPE_BLOB) {
+    return (field->charset()->state & MY_CS_NOPAD);
+  }
+  return false;
+}
+
+
 /*
   Create structures needed for storing data in rocksdb. This is called when the
   table is created. The structures will be shared by all TABLE* objects.
@@ -6072,8 +6085,7 @@ int ha_rocksdb::create_cfs(
   for (uint i = 0; i < tbl_def_arg->m_key_count; i++) {
     rocksdb::ColumnFamilyHandle *cf_handle;
 
-    if (rocksdb_strict_collation_check &&
-        !is_hidden_pk(i, table_arg, tbl_def_arg) &&
+    if (!is_hidden_pk(i, table_arg, tbl_def_arg) &&
         tbl_def_arg->base_tablename().find(tmp_file_prefix) != 0) {
       if (!tsys_set)
       {
@@ -6085,7 +6097,16 @@ int ha_rocksdb::create_cfs(
       for (uint part = 0; part < table_arg->key_info[i].ext_key_parts; 
            part++)
       {
-        if (!rdb_is_index_collation_supported(
+        /* MariaDB: disallow NOPAD collations */
+        if (rdb_field_uses_nopad_collation(
+              table_arg->key_info[i].key_part[part].field))
+        {
+          my_error(ER_MYROCKS_CANT_NOPAD_COLLATION, MYF(0));
+          DBUG_RETURN(HA_EXIT_FAILURE);
+        }
+
+        if (rocksdb_strict_collation_check &&
+            !rdb_is_index_collation_supported(
                 table_arg->key_info[i].key_part[part].field) &&
             !rdb_collation_exceptions->matches(tablename_sys)) {
           std::string collation_err;

storage/rocksdb/mysql-test/rocksdb/r/mariadb_port_fixes.result

@@ -55,3 +55,12 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	range	a	a	32	NULL	#	Using where
 drop table t1,t2;
 set global rocksdb_strict_collation_check=@tmp_rscc;
+#
+# MDEV-14389: MyRocks and NOPAD collations
+#
+create table t1 (pk varchar(10) collate latin1_nopad_bin, primary key(pk)) engine=rocksdb;
+ERROR HY000: MyRocks doesn't currently support collations with "No pad" attribute.
+set global rocksdb_strict_collation_check=off;
+create table t1 (pk varchar(10) collate latin1_nopad_bin, primary key(pk)) engine=rocksdb;
+ERROR HY000: MyRocks doesn't currently support collations with "No pad" attribute.
+set global rocksdb_strict_collation_check=@tmp_rscc;

storage/rocksdb/mysql-test/rocksdb/t/mariadb_port_fixes.test

@@ -54,3 +54,16 @@ explain select a from t2 where a <'zzz';
 drop table t1,t2;
 
 set global rocksdb_strict_collation_check=@tmp_rscc;
+
+--echo #
+--echo # MDEV-14389: MyRocks and NOPAD collations
+--echo #
+
+--error ER_MYROCKS_CANT_NOPAD_COLLATION
+create table t1 (pk varchar(10) collate latin1_nopad_bin, primary key(pk)) engine=rocksdb;
+
+set global rocksdb_strict_collation_check=off;
+--error ER_MYROCKS_CANT_NOPAD_COLLATION
+create table t1 (pk varchar(10) collate latin1_nopad_bin, primary key(pk)) engine=rocksdb;
+
+set global rocksdb_strict_collation_check=@tmp_rscc;