Cheolsoo Park created PIG-3510:
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Summary: New filter extractor fails with more than one filter
statement
Key: PIG-3510
URL: https://issues.apache.org/jira/browse/PIG-3510
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.12.0
Reporter: Cheolsoo Park
Assignee: Cheolsoo Park
Fix For: 0.12.1
This is a regression from PIG-3461 - rewrite of partition filter optimizer.
Here is an example that demonstrates the problem:
{code:title=two filters}
b = FILTER a BY (dateint >= 20130901 AND dateint <= 20131001);
c = FILTER b BY (event_id == 419 OR event_id == 418);
{code}
{code:title=one filter}
b = FILTER a BY (dateint >= 20130901 AND dateint <= 20131001) AND (event_id ==
419 OR event_id == 418);
{code}
Both dateint and event_id are partition columns. For the 1 filter case, the
whole expression is pushed down whereas for the 2 filter case, only (event_id
== 419 OR event_id == 418) is pushed down.
The reason is the filter extractor overwrites the pushdown expression that it
extracted from the 1st statement while visiting the 2nd statement.
{code}
private Expression pushdownExpr = null;
{code}
The old filter extractor used to keep pushdown expressions in array and
assemble them with AND at the end.
{code}
private ArrayList<Expression> pColConditions = new ArrayList<Expression>();
{code}
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