Dilip Biswal 6001d476ce [SPARK-27596][SQL] The JDBC 'query' option doesn't work for Oracle database ... ## What changes were proposed in this pull request? **Description from JIRA** For the JDBC option `query`, we use the identifier name to start with underscore: s"(${subquery}) _SPARK_GEN_JDBC_SUBQUERY_NAME${curId.getAndIncrement()}". This is not supported by Oracle. The Oracle doesn't seem to support identifier name to start with non-alphabet character (unless it is quoted) and has length restrictions as well. [link](https://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements008.htm) In this PR, the generated alias name 'SPARK_GEN_JDBC_SUBQUERY_NAME<int value>' is fixed to remove "_" prefix and also the alias name is shortened to not exceed the identifier length limit. ## How was this patch tested? Tests are added for MySql, Postgress, Oracle and DB2 to ensure enough coverage. Closes #24532 from dilipbiswal/SPARK-27596. Authored-by: Dilip Biswal <dbiswal@us.ibm.com> Signed-off-by: gatorsmile <gatorsmile@gmail.com>		2019-05-05 21:52:23 -07:00
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src/test/scala/org/apache/spark	[SPARK-27596][SQL] The JDBC 'query' option doesn't work for Oracle database	2019-05-05 21:52:23 -07:00
pom.xml	[SPARK-27168][SQL][TEST] Add docker integration test for MsSql server	2019-03-19 08:43:23 -07:00