Evaluate where clause in aggregation queries (#7235)

pkg/s3select/sql/statement.go

@@ -122,9 +122,35 @@ func (e *SelectStatement) AggregateResult(output Record) error {
 	return nil
 }
 
+func (e *SelectStatement) isPassingWhereClause(input Record) (bool, error) {
+	if e.selectAST.Where == nil {
+		return true, nil
+	}
+	value, err := e.selectAST.Where.evalNode(input)
+	if err != nil {
+		return false, err
+	}
+
+	b, ok := value.ToBool()
+	if !ok {
+		err = fmt.Errorf("WHERE expression did not return bool")
+		return false, err
+	}
+
+	return b, nil
+}
+
 // AggregateRow - aggregates the input record. Applies only to
 // aggregation queries.
 func (e *SelectStatement) AggregateRow(input Record) error {
+	ok, err := e.isPassingWhereClause(input)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return nil
+	}
+
 	for _, expr := range e.selectAST.Expression.Expressions {
 		err := expr.aggregateRow(input)
 		if err != nil {
@@ -137,23 +163,13 @@ func (e *SelectStatement) AggregateRow(input Record) error {
 // Eval - evaluates the Select statement for the given record. It
 // applies only to non-aggregation queries.
 func (e *SelectStatement) Eval(input, output Record) (Record, error) {
-	if whereExpr := e.selectAST.Where; whereExpr != nil {
-		value, err := whereExpr.evalNode(input)
+	ok, err := e.isPassingWhereClause(input)
 	if err != nil {
 		return nil, err
 	}
-
-		b, ok := value.ToBool()
 	if !ok {
-			err = fmt.Errorf("WHERE expression did not return bool")
-			return nil, err
-		}
-
-		if !b {
-			// Where clause is not satisfied by the row
 		return nil, nil
 	}
-	}
 
 	if e.selectAST.Expression.All {
 		// Return the input record for `SELECT * FROM