Anupam Aggarwal created CALCITE-2915:
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Summary: Add RelToSqlConverter support for EnumerableLimit
Key: CALCITE-2915
URL: https://issues.apache.org/jira/browse/CALCITE-2915
Project: Calcite
Issue Type: Improvement
Affects Versions: 1.18.0
Reporter: Anupam Aggarwal
Enhancing RelToSqlConverter to handle certain physical relNodes.
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Currently a query like this
_Select * from foo.bar where limit 10 ;_
Results in the following (physical) plan (after a MV rewrite to a different
table) using volcano
_EnumerableLimit(fetch=[1]): rowcount = 1.0, cumulative cost = \{1.0 rows, 2.0
cpu, 0.0 io}, id = 303_
_EnumerableTableScan(table=[[viewSchema, barView]]): rowcount = 1.0,
cumulative cost = \{0.0 rows, 1.0 cpu, 0.0 io}, id = 176_
While converting the relNode to sql using RelToSqlConverter we get an
exception saying
_Caused by: java.lang.reflect.InvocationTargetException_
_Caused by: java.lang.AssertionError: Need to implement
org.apache.calcite.adapter.enumerable.EnumerableLimit_
__
RelToSqlConverter does not handle EnumerableLimit currently.
More context :-
http://mail-archives.apache.org/mod_mbox/calcite-dev/201903.mbox/browser
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