feat: predicate extractor (region prune part 1) (#6729)

* feat: predicate extractor (region prune part 1)

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* stricter check

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

---------

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

src/partition/src/expr.rs

@@ -252,6 +252,18 @@ impl PartitionExpr {
         Ok(expr)
     }
 
+    pub fn lhs(&self) -> &Operand {
+        &self.lhs
+    }
+
+    pub fn rhs(&self) -> &Operand {
+        &self.rhs
+    }
+
+    pub fn op(&self) -> &RestrictedOp {
+        &self.op
+    }
+
     pub fn try_as_physical_expr(
         &self,
         schema: &arrow::datatypes::SchemaRef,

src/query/src/dist_plan.rs

@@ -17,6 +17,8 @@ mod commutativity;
 mod merge_scan;
 mod merge_sort;
 mod planner;
+#[allow(dead_code)]
+mod predicate_extractor;
 
 pub use analyzer::{DistPlannerAnalyzer, DistPlannerOptions};
 pub use merge_scan::{MergeScanExec, MergeScanLogicalPlan};