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This pull request adds support for queries with an
UNION
keyword. I found a way to support them with a small update tointernal/compiler
.I noticed that an
UNION
changes howast.SelectStmt
is parsed:TargetList
field is emptyLarg
andRarg
fields contain the two part of the unionBy changing
outputColumns
to look at theLarg
field whenTargetList
is empty, the columns are returned and the code generation succeed.I have added test cases for a
SELECT
with anUNION
and aWITH RECURSIVE
query.It should fix #568, #723 and #778.