Yin Huai created HIVE-4960:
------------------------------
Summary: lastAlias in CommonJoinOperator is not used
Key: HIVE-4960
URL: https://issues.apache.org/jira/browse/HIVE-4960
Project: Hive
Issue Type: Improvement
Reporter: Yin Huai
Assignee: Yin Huai
Priority: Minor
In CommonJoinOperator, there is object called lastAlias. The initial value of
this object is 'null'. After tracing the usage of this object, I found that
there is no place to change the value of this object. Also, it is only used in
processOp in JoinOperator and MapJoinOperator as
{code}
if ((lastAlias == null) || (!lastAlias.equals(alias))) {
nextSz = joinEmitInterval;
}
{\code}
Since lastAlias will always be null, we will assign joinEmitInterval to nextSz
every time we get a row. Later in processOp, we have
{code}
nextSz = getNextSize(nextSz);
{\code}
Because we reset the value of nextSz to joinEmitInterval every time we get a
row, seems that getNextSize will not be used as expected.
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