Robert Roland created PHOENIX-947:
-------------------------------------
Summary: Zero length strings are incorrectly treated as NULL
Key: PHOENIX-947
URL: https://issues.apache.org/jira/browse/PHOENIX-947
Project: Phoenix
Issue Type: Bug
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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