MySQL Control Flow Functions unsupported

[benvogan]

Hi there,

I tried pointing Tableau at the MySQL gateway (harsh, I know) and unsurprisingly it failed. It did manage to handshake and identify the databases, but then it failed when trying to get the schema information. There are at least 2 problems and I'm logging them separately. This is the second one: Tableau is using some funky SQL to try an inspect the database and it is not parsing.

[2] Got SQL: SELECT A.REFERENCED_TABLE_SCHEMA AS PKTABLE_CAT,NULL AS PKTABLE_SCHEM,A.REFERENCED_TABLE_NAME AS PKTABLE_NAME,A.REFERENCED_COLUMN_NAME AS PKCOLUMN_NAME,A.TABLE_SCHEMA AS FKTABLE_CAT, NULL AS FKTABLE_SCHEM,A.TABLE_NAME AS FKTABLE_NAME,A.COLUMN_NAME AS FKCOLUMN_NAME,A.ORDINAL_POSITION AS KEY_SEQ,CASE WHEN R.UPDATE_RULE = 'CASCADE' THEN 0 WHEN R.UPDATE_RULE = 'SET NULL' THEN 2 WHEN R.UPDATE_RULE = 'SET DEFAULT' THEN 4 WHEN R.UPDATE_RULE = 'SET RESTRICT' THEN 1 WHEN R.UPDATE_RULE = 'SET NO ACTION' THEN 3 ELSE 3 END AS UPDATE_RULE,CASE WHEN R.DELETE_RULE = 'CASCADE' THEN 0 WHEN R.DELETE_RULE = 'SET NULL' THEN 2 WHEN R.DELETE_RULE = 'SET DEFAULT' THEN 4 WHEN R.DELETE_RULE = 'SET RESTRICT' THEN 1 WHEN R.DELETE_RULE = 'SET NO ACTION' THEN 3 ELSE 3 END AS DELETE_RULE,A.CONSTRAINT_NAME AS FK_NAME,'PRIMARY' AS PK_NAME,7 AS DEFERRABILITY FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE A JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE D ON (D.TABLE_SCHEMA=A.REFERENCED_TABLE_SCHEMA AND D.TABLE_NAME=A.REFERENCED_TABLE_NAME AND D.COLUMN_NAME=A.REFERENCED_COLUMN_NAME) JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS R ON (R.CONSTRAINT_NAME = A.CONSTRAINT_NAME AND R.TABLE_NAME = A.TABLE_NAME AND R.CONSTRAINT_SCHEMA = A.TABLE_SCHEMA) WHERE D.CONSTRAINT_NAME='PRIMARY' AND A.TABLE_SCHEMA = 'plyql1' AND A.TABLE_NAME = 'client_logs' ORDER BY FKTABLE_CAT, FKTABLE_NAME, KEY_SEQ, PKTABLE_NAME

Failed to resolve query with Plywood.
Query:
SELECT A.REFERENCED_TABLE_SCHEMA AS PKTABLE_CAT,NULL AS PKTABLE_SCHEM,A.REFERENCED_TABLE_NAME AS PKTABLE_NAME,A.REFERENCED_COLUMN_NAME AS PKCOLUMN_NAME,A.TABLE_SCHEMA AS FKTABLE_CAT, NULL AS FKTABLE_SCHEM,A.TABLE_NAME AS FKTABLE_NAME,A.COLUMN_NAME AS FKCOLUMN_NAME,A.ORDINAL_POSITION AS KEY_SEQ,CASE WHEN R.UPDATE_RULE = 'CASCADE' THEN 0 WHEN R.UPDATE_RULE = 'SET NULL' THEN 2 WHEN R.UPDATE_RULE = 'SET DEFAULT' THEN 4 WHEN R.UPDATE_RULE = 'SET RESTRICT' THEN 1 WHEN R.UPDATE_RULE = 'SET NO ACTION' THEN 3 ELSE 3 END AS UPDATE_RULE,CASE WHEN R.DELETE_RULE = 'CASCADE' THEN 0 WHEN R.DELETE_RULE = 'SET NULL' THEN 2 WHEN R.DELETE_RULE = 'SET DEFAULT' THEN 4 WHEN R.DELETE_RULE = 'SET RESTRICT' THEN 1 WHEN R.DELETE_RULE = 'SET NO ACTION' THEN 3 ELSE 3 END AS DELETE_RULE,A.CONSTRAINT_NAME AS FK_NAME,'PRIMARY' AS PK_NAME,7 AS DEFERRABILITY FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE A JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE D ON (D.TABLE_SCHEMA=A.REFERENCED_TABLE_SCHEMA AND D.TABLE_NAME=A.REFERENCED_TABLE_NAME AND D.COLUMN_NAME=A.REFERENCED_COLUMN_NAME) JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS R ON (R.CONSTRAINT_NAME = A.CONSTRAINT_NAME AND R.TABLE_NAME = A.TABLE_NAME AND R.CONSTRAINT_SCHEMA = A.TABLE_SCHEMA) WHERE D.CONSTRAINT_NAME='PRIMARY' AND A.TABLE_SCHEMA = 'plyql1' AND A.TABLE_NAME = 'client_logs' ORDER BY FKTABLE_CAT, FKTABLE_NAME, KEY_SEQ, PKTABLE_NAME
If you believe this query should work please create an issue on PlyQL and include this section
Issue url: https://github.com/implydata/plyql/issues

[Vadim Ogievetsky]

huh, interesting. I got Tableau 9.3 past the handshake somehow. Anyhow thanks for that query it is really beautiful. I really love it when SQL is in ALL CAPS it makes it sound like Tableau is screaming at the gateway which is how I like to imagine it.

[David Gee]

Please note that this project is now deprecated. Please see the Druid SQL docs for information on using SQL syntax with Druid.