Danny Chen created CALCITE-4073:
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Summary: Add a new component RexNormalize for more effect rex
nodes normalization
Key: CALCITE-4073
URL: https://issues.apache.org/jira/browse/CALCITE-4073
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.24.0
Reporter: Danny Chen
Assignee: Danny Chen
Fix For: 1.24.0
Currently, we only have simple normalization such as:
$2 = $1 => $1 = $2
$2 > $1 => $1 < $2
we can extend the logic to more like:
- put the complex predicates behind, like OR(OR(udf($1), $2), $3) => OR($3,
OR(udf($1), $2))
- put the udf operand behind, like OR(udf($1), $2) => OR($2, udf($1))
- put the local variables that appears more frequently in the front, which is
more user-friendly to code generation because the variable can be cached and
reused.
Also note that, we should allows flexible configuration for switch this
function on/off(not a system calcite property now) for downstream users and
projects(because the normalization may have some performance trade-off).
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