[DRILL-5295] Unable to query INFORMATION_SCHEMA.`TABLES` if MySql storage plugin enabled

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 1.9.0
• Fix Version/s: 1.16.0

Environment

Drill 1.9. Error can be reproduced running Drill locally on Windows and on Linux within zookeeper. I can reproduce it with 2 mysql servers.

• Flags: Important
• Assignee: Unassigned
• Reporter: Martina Ponca
• Created: 23/Feb/17 01:34
• Updated: 11/Mar/19 13:43
• Resolved: 11/Mar/19 13:43

Description

Impact: Unable to connect from Qlik Sense to Drill because of MySql Storage Plugin enabled.

Steps to repro:
1. Create a new storage plugin to MySql Community Edition 5.5.43. Enable it.
2. Run query: "select * from INFORMATION_SCHEMA.`TABLES`"
3. Error:

Error: SYSTEM ERROR: NullPointerException: Error. Type information for table bistoremysql.information_schema.CHARACTER_SETS provided is null.
Fragment 0:0
[Error Id: 2717cfe1-413d-4330-ab3f-720ae92ebc50 on mycomputer.domain.lan:31010]

  (java.lang.NullPointerException) Error. Type information for table bistoremysql.information_schema.CHARACTER_SETS provided is null.
    com.google.common.base.Preconditions.checkNotNull():250
    org.apache.drill.exec.store.ischema.InfoSchemaRecordGenerator$Tables.visitTableWithType():314
    org.apache.drill.exec.store.ischema.InfoSchemaRecordGenerator$Tables.visitTables():308
    org.apache.drill.exec.store.ischema.InfoSchemaRecordGenerator.scanSchema():215
    org.apache.drill.exec.store.ischema.InfoSchemaRecordGenerator.scanSchema():208
    org.apache.drill.exec.store.ischema.InfoSchemaRecordGenerator.scanSchema():208
    org.apache.drill.exec.store.ischema.InfoSchemaRecordGenerator.scanSchema():195
    org.apache.drill.exec.store.ischema.InfoSchemaTableType.getRecordReader():58
    org.apache.drill.exec.store.ischema.InfoSchemaBatchCreator.getBatch():36
    org.apache.drill.exec.store.ischema.InfoSchemaBatchCreator.getBatch():30
    org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch():148
    org.apache.drill.exec.physical.impl.ImplCreator.getChildren():171
    org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch():128
    org.apache.drill.exec.physical.impl.ImplCreator.getChildren():171
    org.apache.drill.exec.physical.impl.ImplCreator.getRootExec():101
    org.apache.drill.exec.physical.impl.ImplCreator.getExec():79
    org.apache.drill.exec.work.fragment.FragmentExecutor.run():206
    org.apache.drill.common.SelfCleaningRunnable.run():38
    java.util.concurrent.ThreadPoolExecutor.runWorker():1145
    java.util.concurrent.ThreadPoolExecutor$Worker.run():615
    java.lang.Thread.run():745 (state=,code=0)

The full query Qlik Sense runs:

select TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, TABLE_TYPE from INFORMATION_SCHEMA.`TABLES` WHERE TABLE_CATALOG LIKE 'DRILL' ESCAPE '\' AND TABLE_SCHEMA <> 'sys' AND TABLE_SCHEMA <> 'INFORMATION_SCHEMA'ORDER BY TABLE_TYPE, TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME

If I disable the mysql storage plugin, I can run the query and connect from Qlik (not a workaround).

This issue cannot be reproduced using Drill 1.5.

Issue Links

• is related to: DRILL-4925 Add types filter to getTables metadata API