wip

_posts/2024/2024-05-13-tidb-join.md

@@ -6,6 +6,8 @@ category:
 tags: [tidb, golang]
 --- 
 
+## Join
+
 
 ```go
 
@@ -60,10 +62,24 @@ func (b *planBuilder) buildJoin(join *ast.Join) LogicalPlan {
 
 ```
 
+## Group by
 
 ```go
 
+// LogicalAggregation represents an aggregate plan.
+type LogicalAggregation struct {
+	logicalSchemaProducer
+
 // AggFuncDesc describes an aggregation function signature, only used in planner.
+	AggFuncs     []*aggregation.AggFuncDesc
+	GroupByItems []expression.Expression
+	// groupByCols stores the columns that are group-by items.
+	groupByCols []*expression.Column
+
+	possibleProperties [][]*expression.Column
+	inputCount         float64 // inputCount is the input count of this plan.
+}
+
 type AggFuncDesc struct {
 	// Name represents the aggregation function name.
 	Name string
@@ -77,18 +93,5 @@ type AggFuncDesc struct {
 	HasDistinct bool
 }
 
-// LogicalAggregation represents an aggregate plan.
-type LogicalAggregation struct {
-	logicalSchemaProducer
-
-	AggFuncs     []*aggregation.AggFuncDesc
-	GroupByItems []expression.Expression
-	// groupByCols stores the columns that are group-by items.
-	groupByCols []*expression.Column
-
-	possibleProperties [][]*expression.Column
-	inputCount         float64 // inputCount is the input count of this plan.
-}
-
 ```