fix(query): improve update handling about nondeterministic_update and add nullable columns

Added `replace_column_datatype_to_nullable` method to support updates involving nullable column types. Refactored `rewrite_nondeterministic_update` logic to use matcher-based pattern matching for enhanced clarity and maintainability. Updated tests to include scenarios with CTEs and nullable columns for improved test coverage.

Handle non-nullable expressions in update bindings

This update ensures non-nullable expressions are unified with nullable data types where required, maintaining consistency in type handling. Additionally, it includes error logging for cases when data type retrieval fails, improving debugging visibility.

Author: loloxwg

src/query/sql/src/planner/binder/bind_mutation/update.rs

@@ -28,10 +28,12 @@ use crate::binder::bind_mutation::bind::MutationStrategy;
 use crate::binder::bind_mutation::mutation_expression::MutationExpression;
 use crate::binder::util::TableIdentifier;
 use crate::binder::Binder;
+use crate::optimizer::ir::Matcher;
 use crate::optimizer::ir::SExpr;
 use crate::plans::AggregateFunction;
 use crate::plans::BoundColumnRef;
 use crate::plans::Plan;
+use crate::plans::RelOp;
 use crate::plans::RelOperator;
 use crate::plans::ScalarItem;
 use crate::plans::VisitorMut;
@@ -118,17 +120,20 @@ impl Binder {
         let Plan::DataMutation { box s_expr, .. } = &plan else {
             return Ok(plan);
         };
-        let RelOperator::Mutation(mutation) = &*s_expr.plan else {
+        let RelOperator::Mutation(mutation) = s_expr.plan() else {
             return Ok(plan);
         };
-        let filter_expr = &s_expr.children[0];
-        let RelOperator::Filter(_) = &*filter_expr.plan else {
-            return Ok(plan);
+        let input_expr = s_expr.unary_child();
+        let matcher = Matcher::MatchOp {
+            op_type: RelOp::Filter,
+            children: vec![Matcher::MatchOp {
+                op_type: RelOp::Join,
+                children: vec![Matcher::Leaf, Matcher::Leaf],
+            }],
         };
-        let input = &filter_expr.children[0];
-        let RelOperator::Join(_) = &*input.plan else {
+        if !matcher.matches(input_expr) {
             return Ok(plan);
-        };
+        }
 
         let mut mutation = mutation.clone();
 
@@ -176,7 +181,6 @@ impl Binder {
                         .flat_map(|expr| expr.used_columns().into_iter())
                 })
             })
-            .chain(mutation.required_columns.iter().copied())
             .collect::<HashSet<_>>();
 
         let used_columns = used_columns
@@ -201,7 +205,7 @@ impl Binder {
 
                 let display_name = format!("any({})", binding.index);
                 let old = binding.index;
-                let mut aggr_func = ScalarExpr::AggregateFunction(AggregateFunction {
+                let mut aggr_func: ScalarExpr = AggregateFunction {
                     span: None,
                     func_name: "any".to_string(),
                     distinct: false,
@@ -213,7 +217,8 @@ impl Binder {
                     return_type: binding.data_type.clone(),
                     sort_descs: vec![],
                     display_name: display_name.clone(),
-                });
+                }
+                .into();
 
                 let mut rewriter =
                     AggregateRewriter::new(&mut mutation.bind_context, self.metadata.clone());
@@ -242,14 +247,14 @@ impl Binder {
         for eval in &mut mutation.matched_evaluators {
             if let Some(expr) = &mut eval.condition {
                 for (_, old, new) in &aggr_columns {
-                    expr.replace_column(*old, *new)?
+                    expr.replace_column_datatype_to_nullable(*old, *new)?
                 }
             }
 
             if let Some(update) = &mut eval.update {
                 for (_, expr) in update.iter_mut() {
                     for (_, old, new) in &aggr_columns {
-                        expr.replace_column(*old, *new)?
+                        expr.replace_column_datatype_to_nullable(*old, *new)?
                     }
                 }
             }
@@ -270,26 +275,23 @@ impl Binder {
                 .collect(),
         );
 
-        let aggr_expr = self.bind_aggregate(&mut mutation.bind_context, (**filter_expr).clone())?;
+        let aggr_expr = self.bind_aggregate(&mut mutation.bind_context, input_expr.clone())?;
 
-        let s_expr = SExpr::create_unary(
+        let s_expr = Box::new(SExpr::create_unary(
             Arc::new(RelOperator::Mutation(mutation)),
             Arc::new(aggr_expr),
-        );
+        ));
 
         let Plan::DataMutation {
             schema, metadata, ..
         } = plan
         else {
             unreachable!()
         };
-
-        let plan = Plan::DataMutation {
-            s_expr: Box::new(s_expr),
+        Ok(Plan::DataMutation {
+            s_expr,
             schema,
             metadata,
-        };
-
-        Ok(plan)
+        })
     }
 }

src/query/sql/src/planner/plans/scalar_expr.rs

@@ -293,6 +293,33 @@ impl ScalarExpr {
         Ok(())
     }
 
+    pub fn replace_column_datatype_to_nullable(
+        &mut self,
+        old: IndexType,
+        new: IndexType,
+    ) -> Result<()> {
+        struct Replace {
+            old: IndexType,
+            new: IndexType,
+        }
+
+        impl VisitorMut<'_> for Replace {
+            fn visit_bound_column_ref(&mut self, col: &mut BoundColumnRef) -> Result<()> {
+                if col.column.index == self.old {
+                    col.column.index = self.new;
+                    if !col.column.data_type.is_nullable() {
+                        col.column.data_type = Box::new(col.column.data_type.wrap_nullable())
+                    }
+                }
+                Ok(())
+            }
+        }
+
+        let mut visitor = Replace { old, new };
+        visitor.visit(self)?;
+        Ok(())
+    }
+
     pub fn columns_and_data_types(&self, metadata: MetadataRef) -> HashMap<usize, DataType> {
         struct UsedColumnsVisitor {
             columns: HashMap<IndexType, DataType>,

tests/sqllogictests/suites/query/cte/update_cte.test

@@ -79,6 +79,23 @@ select * from t2;
 statement error (?s)1065.*?column a doesn't exist
 with tt1 as (select * from t1) update t2 set a = tt1.a;
 
-
 statement ok
 drop table t2;
+
+statement ok
+create or replace table test_merge(col1 varchar, col2 varchar, col3 varchar);
+
+statement ok
+insert into test_merge values(2,'abc',2),(3,'abc',3),(4,'abc',4);
+
+statement ok
+with tbb("col1", "col2", "col3") as (values ('1', 'add', '11'), ('4', 'add', '44')) update test_merge tba set tba.col1 =tbb.col1, tba.col2 = 'update', tba.col3 = tbb.col3 from tbb where tba.col1 = tbb.col1;
+
+statement ok
+with tbb as (select col0::string null col1,col1::string null col2,col2::string null col3 from (values ('1', 'add', '11'), ('4', 'add', '44'))) update test_merge tba set tba.col1 =tbb.col1, tba.col2 = 'update', tba.col3 = tbb.col3 from tbb where tba.col1 = tbb.col1;
+
+statement ok
+with tbb("col1", "col2", "col3") as (values ('1', 'add', '11'), ('4', 'add', '44')) update test_merge tba set tba.col1 =tbb.col1::string null, tba.col2 = 'update', tba.col3 = tbb.col3::string null from tbb where tba.col1 = tbb.col1::string null;
+
+statement ok
+drop table test_merge;