Jinfeng Ni created DRILL-4715:
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Summary: Java compilation error for a query with large number of
expressions
Key: DRILL-4715
URL: https://issues.apache.org/jira/browse/DRILL-4715
Project: Apache Drill
Issue Type: Bug
Components: Execution - Codegen
Reporter: Jinfeng Ni
The following query would hit compilation error, when Drill generates and
compiles the run-time code.
Q1 :
{code}
select expr1, expr2, expr3, ...., exprN
from table
{code}
In Q1, expr1, expr2, ..., exprN are non-trivial expression (in stead of simply
column reference), and N is big enough, then the run-time generated code may
have a method which goes beyond the 64k limit imposed by JVM.
This seems to be a regression from DRILL-3912 (Common subexpression
elimination). CSE tries to put as many expressions in one block as possible, to
detect and eliminate as many CSE as possible. However, this implies we may end
up with big method with compilation error.
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