SQL: Make row extractions extensible and add one for lookups. #3991
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This is a reopening of apache#3989, since that PR was merged to master prematurely and accidentally.
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This is a reopening of #3989, since that PR was merged to master prematurely
and accidentally.
Two main changes here:
Fold ExpressionConverter into Expressions.toRowExtraction, and make the latter take a DruidOperatorTable so the conversion of SQL expressions to Druid expressions is now extensible.
Add a LookupExtractionOperator which offers a Druid SQL function
LOOKUP(expression, lookupName)that hooks into query time lookups.