Fix a bug in the optimization rule that adds FilterJoins. #5
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Also updated execution query tests to support testing LIP.
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The bug is that after pushing down FilterJoin nodes the output attributes may be changed, and this causes problems for some nodes (e.g. UnionAll).
Also updated execution query tests to support executing commands (e.g.
\analyze) and testing LIP.The context of this PR is to merge the
trace-devbranch intomaster(#1).