James Taylor created HBASE-9316:
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Summary: Use JoinedHeap between MUST_PASS_ALL filters to better
leverage essential column family feature
Key: HBASE-9316
URL: https://issues.apache.org/jira/browse/HBASE-9316
Project: HBase
Issue Type: Bug
Reporter: James Taylor
Currently, all column families in a MUST_PASS_ALL filter list are loaded in
advance of filtering. Instead, only the essential column family from the first
filter should be loaded and then its heap joined with subsequent essential
column family from the next filter in the list (probably up to some
reasonable/configurable limit).
One particular Phoenix use case for this is when a SQL query is trying to
detect the absence of a KeyValue (though a <column> IS NULL clause). Our
workaround for a Phoenix TABLE is to insert a known, empty key value with every
row, or for a Phoenix VIEW (mapping to an existing HBase table) to project
everything. With this feature, we could instead use a filter per column family
and prevent the loading of the corresponding Store in many cases.
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