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https://issues.apache.org/jira/browse/PHOENIX-947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
James Taylor updated PHOENIX-947:
---------------------------------
Issue Type: New Feature (was: Bug)
> Zero length strings are incorrectly treated as NULL
> ----------------------------------------------------
>
> Key: PHOENIX-947
> URL: https://issues.apache.org/jira/browse/PHOENIX-947
> Project: Phoenix
> Issue Type: New Feature
> Affects Versions: 3.0.0
> Reporter: Robert Roland
>
> Given the following table schema, you should be able to insert an empty
> string into the TESTSTR column:
> {code}
> CREATE TABLE TEST1 (
> ID INTEGER NOT NULL PRIMARY KEY,
> TESTSTR VARCHAR(255) NOT NULL,
> TESTSTR2 VARCHAR(255)
> );
> UPSERT INTO TEST1 (ID, TESTSTR, TESTSTR2)
> VALUES (1, '', 'foo');
> {code}
> Instead, you are given an error:
> {noformat}
> org.apache.phoenix.schema.ConstraintViolationException: TEST1.TESTSTR may not
> be null
> at
> org.apache.phoenix.schema.PTableImpl$PRowImpl.setValue(PTableImpl.java:618)
> at
> org.apache.phoenix.execute.MutationState.addRowMutations(MutationState.java:176)
> at org.apache.phoenix.execute.MutationState.commit(MutationState.java:350)
> at
> org.apache.phoenix.jdbc.PhoenixConnection.commit(PhoenixConnection.java:351)
> at
> org.apache.phoenix.jdbc.PhoenixStatement.executeMutation(PhoenixStatement.java:229)
> at
> org.apache.phoenix.jdbc.PhoenixStatement.execute(PhoenixStatement.java:919)
> at sqlline.SqlLine$Commands.execute(SqlLine.java:3673)
> at sqlline.SqlLine$Commands.sql(SqlLine.java:3584)
> at sqlline.SqlLine.dispatch(SqlLine.java:821)
> at sqlline.SqlLine.begin(SqlLine.java:699)
> at sqlline.SqlLine.mainWithInputRedirection(SqlLine.java:441)
> at sqlline.SqlLine.main(SqlLine.java:424)
> {noformat}
> SQL92 specifies that zero-length strings are not NULL. SQL99 changes this a
> bit:
> "In SQL-92, if the value of a character value expression was a zero-length
> string or if a zero-length character string was assigned to a target, there
> were no exception conditions permitted. In SQL:1999, it is
> implementation-defined whether in these circumstances an exception condition
> is raised: data-exception--zero-length character string. (This rule provides
> support for some SQL implementations that do not distinguish between
> zero-length character strings and the null value.)"
> - p 777, SQL:1999 - Understanding Relational Language Components, Jim
> Melton, Alan R. Simpson
> While SQL99 relaxed this restriction, it would be ideal to be able to
> represent a zero length string as NOT NULL.
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