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https://issues.apache.org/jira/browse/HIVE-4409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642699#comment-13642699
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Namit Jain commented on HIVE-4409:
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my bad, will do
> Prevent incompatible column type changes
> ----------------------------------------
>
> Key: HIVE-4409
> URL: https://issues.apache.org/jira/browse/HIVE-4409
> Project: Hive
> Issue Type: Improvement
> Components: CLI, Metastore
> Affects Versions: 0.10.0
> Reporter: Dilip Joseph
> Assignee: Dilip Joseph
> Priority: Minor
> Fix For: 0.12.0
>
> Attachments: hive.4409.1.patch, HIVE-4409.D10539.1.patch,
> HIVE-4409.D10539.2.patch
>
>
> If a user changes the type of an existing column of a partitioned table to an
> incompatible type, subsequent accesses of old partitions will result in a
> ClassCastException (see example below). We should prevent the user from
> making incompatible type changes. This feature will be controlled by a new
> config parameter.
> Example:
> CREATE TABLE test_table123 (a INT, b MAP<STRING, STRING>) PARTITIONED BY (ds
> STRING) STORED AS SEQUENCEFILE;
> INSERT OVERWRITE TABLE test_table123 PARTITION(ds="foo1") SELECT 1, MAP("a1",
> "b1") FROM src LIMIT 1;
> SELECT * from test_table123 WHERE ds="foo1";
> SET hive.metastore.disallow.invalid.col.type.changes=true;
> ALTER TABLE test_table123 REPLACE COLUMNS (a INT, b STRING);
> SELECT * from test_table123 WHERE ds="foo1";
> The last SELECT fails with the following exception:
> Failed with exception java.io.IOException:java.lang.ClassCastException:
> org.apache.hadoop.hive.serde2.lazy.objectinspector.LazyMapObjectInspector
> cannot be cast to
> org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector
> java.io.IOException: java.lang.ClassCastException:
> org.apache.hadoop.hive.serde2.lazy.objectinspector.LazyMapObjectInspector
> cannot be cast to
> org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector
> at
> org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:544)
> at
> org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:488)
> at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:136)
> at org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:1406)
> at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:271)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:216)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:413)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:348)
> at org.apache.hadoop.hive.ql.QTestUtil.executeClient(QTestUtil.java:790)
> at org.apache.hadoop.hive.cli.TestCliDriver.runTest(TestCliDriver.java:124)
> at
> org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_class_cast(TestCliDriver.java:108)
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