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Consolidate TreeNode transform and rewrite APIs (apache#8891)
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* refactor `TreeNode::rewrite()`

* use handle_tree_recursion in `Expr`

* use macro for transform recursions

* fix api

* minor fixes

* fix

* don't trust `t.transformed` coming from transformation closures, keep the old way of detecting if changes were made

* rephrase todo comment, always propagate up `t.transformed` from the transformation closure, fix projection pushdown closure

* Fix `TreeNodeRecursion` docs

* extend Skip (Prune) functionality to Jump as it is defined in https://synnada.notion.site/synnada/TreeNode-Design-Proposal-bceac27d18504a2085145550e267c4c1

* fix Jump and add tests

* jump test fixes

* fix clippy

* unify "transform" traversals using macros, fix "visit" traversal jumps, add visit jump tests, ensure consistent naming `f` instead of `op`, `f_down` instead of `pre_visit` and `f_up` instead of `post_visit`

* fix macro rewrite

* minor fixes

* minor fix

* refactor tests

* add transform tests

* add apply, transform_down and transform_up tests

* refactor tests

* test jump on both a and e nodes in both top-down and bottom-up traversals

* better transform/rewrite tests

* minor fix

* simplify tests

* add stop tests, reorganize tests

* fix previous merges and remove leftover file

* Review TreeNode Refactor (#1)

* Minor changes

* Jump doesn't ignore f_up

* update test

* Update rewriter

* LogicalPlan visit update and propagate from children flags

* Update tree_node.rs

* Update map_children's

---------

Co-authored-by: Mustafa Akur <mustafa.akur@synnada.ai>

* fix

* minor fixes

* fix f_up call when f_down returns jump

* simplify code

* minor fix

* revert unnecessary changes

* fix `DynTreeNode` and `ConcreteTreeNode` `transformed` and `tnr` propagation

* introduce TransformedResult helper

* fix docs

* restore transform as alias to trassform_up

* restore transform as alias to trassform_up 2

* Simplifications and comment improvements (#2)

---------

Co-authored-by: Berkay Şahin <124376117+berkaysynnada@users.noreply.github.com>
Co-authored-by: Mustafa Akur <mustafa.akur@synnada.ai>
Co-authored-by: Mehmet Ozan Kabak <ozankabak@gmail.com>
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4 people authored Mar 4, 2024
1 parent 684b4fa commit a84e5f8
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19 changes: 11 additions & 8 deletions datafusion-examples/examples/rewrite_expr.rs
Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@

use arrow::datatypes::{DataType, Field, Schema, SchemaRef};
use datafusion_common::config::ConfigOptions;
use datafusion_common::tree_node::{Transformed, TreeNode};
use datafusion_common::tree_node::{Transformed, TransformedResult, TreeNode};
use datafusion_common::{plan_err, Result, ScalarValue};
use datafusion_expr::{
AggregateUDF, Between, Expr, Filter, LogicalPlan, ScalarUDF, TableSource, WindowUDF,
Expand Down Expand Up @@ -95,14 +95,15 @@ impl MyAnalyzerRule {
Ok(match plan {
LogicalPlan::Filter(filter) => {
let predicate = Self::analyze_expr(filter.predicate.clone())?;
Transformed::Yes(LogicalPlan::Filter(Filter::try_new(
Transformed::yes(LogicalPlan::Filter(Filter::try_new(
predicate,
filter.input,
)?))
}
_ => Transformed::No(plan),
_ => Transformed::no(plan),
})
})
.data()
}

fn analyze_expr(expr: Expr) -> Result<Expr> {
Expand All @@ -111,13 +112,14 @@ impl MyAnalyzerRule {
Ok(match expr {
Expr::Literal(ScalarValue::Int64(i)) => {
// transform to UInt64
Transformed::Yes(Expr::Literal(ScalarValue::UInt64(
Transformed::yes(Expr::Literal(ScalarValue::UInt64(
i.map(|i| i as u64),
)))
}
_ => Transformed::No(expr),
_ => Transformed::no(expr),
})
})
.data()
}
}

Expand Down Expand Up @@ -175,14 +177,15 @@ fn my_rewrite(expr: Expr) -> Result<Expr> {
let low: Expr = *low;
let high: Expr = *high;
if negated {
Transformed::Yes(expr.clone().lt(low).or(expr.gt(high)))
Transformed::yes(expr.clone().lt(low).or(expr.gt(high)))
} else {
Transformed::Yes(expr.clone().gt_eq(low).and(expr.lt_eq(high)))
Transformed::yes(expr.clone().gt_eq(low).and(expr.lt_eq(high)))
}
}
_ => Transformed::No(expr),
_ => Transformed::no(expr),
})
})
.data()
}

#[derive(Default)]
Expand Down
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