[Dashboard] Support arbitrary non-aggregate expressions in dimensions

proto/gen/rill/runtime/v1/runtime.swagger.yaml

@@ -2424,6 +2424,8 @@ definitions:
         type: string
       column:
         type: string
+      expression:
+        type: string
       label:
         type: string
       description:

proto/rill/runtime/v1/resources.proto

@@ -127,6 +127,7 @@ message MetricsViewSpec {
   message DimensionV2 {
     string name = 1;
     string column = 2;
+    string expression = 6;
     string label = 3;
     string description = 4;
     bool unnest = 5;

runtime/compilers/rillv1/parse_metrics_view.go

@@ -34,6 +34,7 @@ type MetricsViewYAML struct {
 		Name        string
 		Label       string
 		Column      string
+		Expression  string
 		Property    string // For backwards compatibility
 		Description string
 		Ignore      bool `yaml:"ignore"`
@@ -213,7 +214,7 @@ func (p *Parser) parseMetricsView(ctx context.Context, node *Node) error {
 	}
 
 	names := make(map[string]bool)
-	columns := make(map[string]bool)
+
 	for i, dim := range tmp.Dimensions {
 		if dim == nil || dim.Ignore {
 			continue
@@ -233,17 +234,15 @@ func (p *Parser) parseMetricsView(ctx context.Context, node *Node) error {
 			}
 		}
 
+		if (dim.Column == "" && dim.Expression == "") || (dim.Column != "" && dim.Expression != "") {
+			return fmt.Errorf("exactly one of column or expression should be set for dimension: %q", dim.Name)
+		}
+
 		lower := strings.ToLower(dim.Name)
 		if ok := names[lower]; ok {
 			return fmt.Errorf("found duplicate dimension or measure name %q", dim.Name)
 		}
 		names[lower] = true
-
-		lower = strings.ToLower(dim.Column)
-		if ok := columns[lower]; ok {
-			return fmt.Errorf("found duplicate dimension column name %q", dim.Column)
-		}
-		columns[lower] = true
 	}
 
 	measureCount := 0
@@ -265,10 +264,6 @@ func (p *Parser) parseMetricsView(ctx context.Context, node *Node) error {
 		}
 		names[lower] = true
 
-		if ok := columns[lower]; ok {
-			return fmt.Errorf("measure name %q coincides with a dimension column name", measure.Name)
-		}
-
 		if measure.FormatPreset != "" && measure.FormatD3 != "" {
 			return fmt.Errorf(`cannot set both "format_preset" and "format_d3" for a measure`)
 		}
@@ -424,6 +419,7 @@ func (p *Parser) parseMetricsView(ctx context.Context, node *Node) error {
 		spec.Dimensions = append(spec.Dimensions, &runtimev1.MetricsViewSpec_DimensionV2{
 			Name:        dim.Name,
 			Column:      dim.Column,
+			Expression:  dim.Expression,
 			Label:       dim.Label,
 			Description: dim.Description,
 			Unnest:      dim.Unnest,

runtime/compilers/rillv1/parser_test.go

@@ -89,6 +89,7 @@ materialize: true
 model: m2
 dimensions:
   - name: a
+    column: a
 measures:
   - name: b
     expression: count(*)
@@ -174,7 +175,7 @@ SELECT * FROM {{ ref "m2" }}
 			MetricsViewSpec: &runtimev1.MetricsViewSpec{
 				Table: "m2",
 				Dimensions: []*runtimev1.MetricsViewSpec_DimensionV2{
-					{Name: "a"},
+					{Name: "a", Column: "a"},
 				},
 				Measures: []*runtimev1.MetricsViewSpec_MeasureV2{
 					{Name: "b", Expression: "count(*)"},
@@ -841,6 +842,7 @@ dashboards:
 table: t1
 dimensions:
   - name: a
+    column: a
 measures:
   - name: b
     expression: count(*)
@@ -850,6 +852,7 @@ measures:
 table: t2
 dimensions:
   - name: a
+    column: a
 measures:
   - name: b
     expression: count(*)
@@ -868,7 +871,7 @@ security:
 			MetricsViewSpec: &runtimev1.MetricsViewSpec{
 				Table: "t1",
 				Dimensions: []*runtimev1.MetricsViewSpec_DimensionV2{
-					{Name: "a"},
+					{Name: "a", Column: "a"},
 				},
 				Measures: []*runtimev1.MetricsViewSpec_MeasureV2{
 					{Name: "b", Expression: "count(*)"},
@@ -887,7 +890,7 @@ security:
 			MetricsViewSpec: &runtimev1.MetricsViewSpec{
 				Table: "t2",
 				Dimensions: []*runtimev1.MetricsViewSpec_DimensionV2{
-					{Name: "a"},
+					{Name: "a", Column: "a"},
 				},
 				Measures: []*runtimev1.MetricsViewSpec_MeasureV2{
 					{Name: "b", Expression: "count(*)"},
@@ -971,6 +974,7 @@ func TestMetricsViewAvoidSelfCyclicRef(t *testing.T) {
 model: d1
 dimensions:
   - name: a
+    column: a
 measures:
   - name: b
     expression: count(*)
@@ -985,7 +989,7 @@ measures:
 			MetricsViewSpec: &runtimev1.MetricsViewSpec{
 				Table: "d1",
 				Dimensions: []*runtimev1.MetricsViewSpec_DimensionV2{
-					{Name: "a"},
+					{Name: "a", Column: "a"},
 				},
 				Measures: []*runtimev1.MetricsViewSpec_MeasureV2{
 					{Name: "b", Expression: "count(*)"},

runtime/queries/column_timeseries.go

@@ -105,13 +105,8 @@ func (q *ColumnTimeseries) Resolve(ctx context.Context, rt *runtime.Runtime, ins
 	}
 
 	return olap.WithConnection(ctx, priority, false, false, func(ctx context.Context, ensuredCtx context.Context, _ *sql.Conn) error {
-		filter, args, err := buildFilterClauseForMetricsViewFilter(q.MetricsView, q.MetricsViewFilter, olap.Dialect(), q.MetricsViewPolicy)
-		if err != nil {
-			return err
-		}
-		if filter != "" {
-			filter = "WHERE 1=1 " + filter
-		}
+		filter := ""
+		var args []any
 
 		measures := normaliseMeasures(q.Measures, q.Pixels != 0)
 		dateTruncSpecifier := convertToDateTruncSpecifier(timeRange.Interval)