MDEV-19632 Replication aborts with ER_SLAVE_CONVERSION_FAILED upon CREATE ... SELECT in ORACLE mode

- Adding optional qualifiers to data types:
    CREATE TABLE t1 (a schema.DATE);
  Qualifiers now work only for three pre-defined schemas:

    mariadb_schema
    oracle_schema
    maxdb_schema

  These schemas are virtual (hard-coded) for now, but may turn into real
  databases on disk in the future.

- mariadb_schema.TYPE now always resolves to a true MariaDB data
  type TYPE without sql_mode specific translations.

- oracle_schema.DATE translates to MariaDB DATETIME.

- maxdb_schema.TIMESTAMP translates to MariaDB DATETIME.

- Fixing SHOW CREATE TABLE to use a qualifier for a data type TYPE
  if the current sql_mode translates TYPE to something else.

The above changes fix the reported problem, so this script:

    SET sql_mode=ORACLE;
    CREATE TABLE t2 AS SELECT mariadb_date_column FROM t1;

is now replicated as:

    SET sql_mode=ORACLE;
    CREATE TABLE t2 (mariadb_date_column mariadb_schema.DATE);

and the slave can unambiguously treat DATE as the true MariaDB DATE
without ORACLE specific translation to DATETIME.

Similar,

    SET sql_mode=MAXDB;
    CREATE TABLE t2 AS SELECT mariadb_timestamp_column FROM t1;

is now replicated as:

    SET sql_mode=MAXDB;
    CREATE TABLE t2 (mariadb_timestamp_column mariadb_schema.TIMESTAMP);

so the slave treats TIMESTAMP as the true MariaDB TIMESTAMP
without MAXDB specific translation to DATETIME.

1 files changed, 10 insertions, 0 deletions

diff --git a/mysql-test/main/lowercase_fs_off.result b/mysql-test/main/lowercase_fs_off.result
index f2a8ec14641..3f0b08a78c4 100644
--- a/mysql-test/main/lowercase_fs_off.result
+++ b/mysql-test/main/lowercase_fs_off.result
@@ -158,3 +158,13 @@ show triggers like '%T1%';
 Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
 drop table t1;
 set GLOBAL sql_mode=default;
+#
+# MDEV-19632 Replication aborts with ER_SLAVE_CONVERSION_FAILED upon CREATE ... SELECT in ORACLE mode
+#
+# Compatibility schema names respect the filesystem case sensitivity
+CREATE TABLE t1 (a MARIADB_SCHEMA.date);
+ERROR HY000: Unknown data type: 'MARIADB_SCHEMA.date'
+CREATE TABLE t1 (a Mariadb_schema.date);
+ERROR HY000: Unknown data type: 'Mariadb_schema.date'
+CREATE TABLE t1 (a mariadb_schema.date);
+DROP TABLE t1;