Expressions: Sql expressions with Duckdb (#81666)

duckdb temp storage of dataframes using parquet and querying from sql expressions
---------

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>

pkg/expr/reader.go

@@ -30,6 +30,7 @@ func NewExpressionQueryReader(features featuremgmt.FeatureToggles) (*ExpressionQ
 }
 
 // ReadQuery implements query.TypedQueryHandler.
+// nolint:gocyclo
 func (h *ExpressionQueryReader) ReadQuery(
 	// Properties that have been parsed off the same node
 	common *rawNode, // common query.CommonQueryProperties
@@ -102,6 +103,13 @@ func (h *ExpressionQueryReader) ReadQuery(
 			eq.Command, err = classic.NewConditionCmd(common.RefID, q.Conditions)
 		}
 
+	case QueryTypeSQL:
+		q := &SQLExpression{}
+		err = iter.ReadVal(q)
+		if err == nil {
+			eq.Command, err = NewSQLCommand(common.RefID, q.Expression, common.TimeRange)
+		}
+
 	case QueryTypeThreshold:
 		q := &ThresholdQuery{}
 		err = iter.ReadVal(q)