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https://issues.apache.org/jira/browse/CASSANDRA-21743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dipankar Achinta reassigned CASSANDRA-21743:
--------------------------------------------
Assignee: Dipankar Achinta
> SELECT JSON of an empty boolean value fails with NullPointerException
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-21743
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21743
> Project: Apache Cassandra
> Issue Type: Bug
> Components: CQL/Semantics
> Reporter: Nadav Har'El
> Assignee: Dipankar Achinta
> Priority: Normal
> Fix For: 5.0.x, 6.x, 7.x
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> A boolean column can hold an empty (zero-length) value, which is different
> from null. Reading it normally works (the driver returns null), but SELECT
> JSON fails with a server error:
> {code:sql}
> CREATE TABLE ks.t (p int PRIMARY KEY, v boolean);
> INSERT INTO ks.t (p, v) VALUES (1, blobAsBoolean(0x));
> SELECT v FROM ks.t; -- works
> SELECT JSON v FROM ks.t; -- fails
> {code}
> The SELECT JSON fails with:
> {noformat}
> Server error: java.lang.NullPointerException: Cannot invoke
> "java.lang.Boolean.toString()" because the return value of
> "org.apache.cassandra.serializers.TypeSerializer.deserialize(java.nio.ByteBuffer)"
> is null
> {noformat}
> For other types this already works: SELECT JSON of an empty int, bigint,
> float, double, decimal, varint, timestamp, uuid, timeuuid, inet or text value
> returns an empty string, "". Most of these cases are covered by
> cql3/EmptyValuesTest, which was added with the fix for CASSANDRA-15896 (the
> same NullPointerException for an empty UUID; the commit message says
> "CASSANDRA-1589", apparently a typo). But EmptyValuesTest has no test for
> boolean (nor for varint or tinyint), which is probably how this case was
> missed.
> The cause is that BooleanType.toJSONString() calls
> getSerializer().deserialize(buffer).toString(), and deserializing an empty
> buffer returns null. Other types handle this case - e.g.,
> Int32Type.toJSONString() returns "\"\"" for an empty value.
> Reproduced on Cassandra 5.0.9 and 6.0-alpha2.
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