Improve GpuExpand by pre-projecting some columns #25
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Signed-off-by: Firestarman <firestarmanllc@gmail.com>
Signed-off-by: Firestarman <firestarmanllc@gmail.com>
Signed-off-by: Firestarman <firestarmanllc@gmail.com>
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Some rules in Spark will put non-leaf expressions into Expand projections, then it can not leverage the GPU tiered projection across the projection lists. So this PR tries to factor out these expressions and evaluate them before expanding to avoid duplicate evaluation for semantic-equal (sub) expressions. --------- Signed-off-by: Firestarman <firestarmanllc@gmail.com>
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Jan 25, 2024
Some rules in Spark will put non-leaf expressions into Expand projections, then it can not leverage the GPU tiered projection across the projection lists. So this PR tries to factor out these expressions and evaluate them before expanding to avoid duplicate evaluation for semantic-equal (sub) expressions. --------- Signed-off-by: Firestarman <firestarmanllc@gmail.com>
firestarman
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Jan 25, 2024
Some rules in Spark will put non-leaf expressions into Expand projections, then it can not leverage the GPU tiered projection across the projection lists. So this PR tries to factor out these expressions and evaluate them before expanding to avoid duplicate evaluation for semantic-equal (sub) expressions. --------- Signed-off-by: Firestarman <firestarmanllc@gmail.com>
firestarman
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Jan 25, 2024
Some rules in Spark will put non-leaf expressions into Expand projections, then it can not leverage the GPU tiered projection across the projection lists. So this PR tries to factor out these expressions and evaluate them before expanding to avoid duplicate evaluation for semantic-equal (sub) expressions. --------- Signed-off-by: Firestarman <firestarmanllc@gmail.com>
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Some rules in Spark will put non-leaf expressions into Expand projections,
then it can not leverage the GPU tiered projection across the projection lists.
So this PR tries to factor out these expressions and evaluate them before
expanding to avoid duplicate evaluation for semantic-equal (sub) expressions.