englefly opened a new pull request, #66906:
URL: https://github.com/apache/doris/pull/66906
### What problem does this PR solve?
Problem Summary:
A project expression that computes a function over a uniform constant slot
(e.g.
`date_sub(dt, INTERVAL 1 DAY)` where `dt` is a uniform constant slot) did
not propagate
the resulting constant: `LogicalProject.computeUniform` only handled
constant projects and
bare slot aliases, so the projected slot had no uniform value and downstream
constant
propagation could not fold predicates over it. For a join predicate like
`t1.dt = p.prev_dt` where `p.prev_dt` is such a projection, the predicate
stayed
unfolded, could not be pushed into the scan, and partition pruning failed.
Fix:
`LogicalProject`/`PhysicalProject`/`LogicalLoadProject.computeUniform` now
fold a project
expression whose input slots are all uniform constants: the constant values
are
substituted into the expression (new helper
`ExpressionUtils.foldToConstantByUniformValues`) and the projected slot is
registered as
a uniform constant, so downstream constant propagation can fold predicates
over it and
push them into the scan for partition pruning.
### Release note
None
### Check List (For Author)
- Test: FE unit test ConstantProjectionFoldingTest (the uniform constant
source is a
filter predicate, independent of constant CTEs; asserts the outer scan
prunes to the
expected single partition).
- Behavior changed: No
- Does this need documentation: No
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