chore | adding the support for passing alias in case of functions (#235)

* chore | adding the support for passing alias in case of functions

Author: aman-bansal

hypertrace-graphql-explorer-schema/src/main/java/org/hypertrace/graphql/explorer/request/ExploreSelectionRequestBuilder.java

@@ -119,7 +119,8 @@ private SelectionArguments getSelectionArguments(SelectedField selectedField) {
                 new SelectionArguments(
                     attributeExpression,
                     aggregationType,
-                    this.getArguments(selectedField, aggregationType)))
+                    this.getArguments(selectedField, aggregationType),
+                    selectedField.getAlias()))
         .orElse(new SelectionArguments(attributeExpression));
   }
 
@@ -145,7 +146,8 @@ private Single<MetricAggregationRequest> buildAggregationRequest(
                 this.aggregationRequestBuilder.build(
                     attributeExpressionAttributeAssociation,
                     arguments.getAggregationType(),
-                    arguments.getAggregationArguments()));
+                    arguments.getAggregationArguments(),
+                    arguments.getAlias()));
   }
 
   private List<Object> getArguments(
@@ -188,16 +190,35 @@ private static class SelectionArguments {
     @Nonnull AttributeExpression attributeExpression;
     @Nullable AttributeModelMetricAggregationType aggregationType;
     @Nullable List<Object> aggregationArguments;
+    @Nullable String alias;
 
     SelectionArguments(AttributeExpression attributeExpression) {
-      this(SelectionType.ATTRIBUTE, attributeExpression, null, null);
+      this(SelectionType.ATTRIBUTE, attributeExpression, null, null, null);
     }
 
     SelectionArguments(
         AttributeExpression attributeExpression,
         AttributeModelMetricAggregationType aggregationType,
         List<Object> aggregationArguments) {
-      this(SelectionType.AGGREGATION, attributeExpression, aggregationType, aggregationArguments);
+      this(
+          SelectionType.AGGREGATION,
+          attributeExpression,
+          aggregationType,
+          aggregationArguments,
+          null);
+    }
+
+    SelectionArguments(
+        AttributeExpression attributeExpression,
+        AttributeModelMetricAggregationType aggregationType,
+        List<Object> aggregationArguments,
+        String alias) {
+      this(
+          SelectionType.AGGREGATION,
+          attributeExpression,
+          aggregationType,
+          aggregationArguments,
+          alias);
     }
   }
 }

hypertrace-graphql-metric-schema/src/main/java/org/hypertrace/graphql/metric/request/DefaultMetricAggregationRequestBuilder.java

@@ -80,16 +80,25 @@ public MetricAggregationRequest build(
       AttributeAssociation<AttributeExpression> attributeExpressionAssociation,
       AttributeModelMetricAggregationType aggregationType,
       List<Object> arguments) {
-    return this.build(attributeExpressionAssociation, aggregationType, arguments, false);
+    return this.build(attributeExpressionAssociation, aggregationType, arguments, false, null);
+  }
+
+  public MetricAggregationRequest build(
+      AttributeAssociation<AttributeExpression> attributeExpressionAssociation,
+      AttributeModelMetricAggregationType aggregationType,
+      List<Object> arguments,
+      String alias) {
+    return this.build(attributeExpressionAssociation, aggregationType, arguments, false, alias);
   }
 
   private MetricAggregationRequest build(
       AttributeAssociation<AttributeExpression> attributeExpressionAssociation,
       AttributeModelMetricAggregationType aggregationType,
       List<Object> arguments,
-      boolean baseline) {
+      boolean baseline,
+      String alias) {
     return new DefaultMetricAggregationRequest(
-        attributeExpressionAssociation, aggregationType, arguments, baseline);
+        attributeExpressionAssociation, aggregationType, arguments, baseline, alias);
   }
 
   private MetricAggregationRequest requestForAggregationField(
@@ -105,7 +114,8 @@ private MetricAggregationRequest requestForAggregationField(
             .findSelections(
                 field.getSelectionSet(), SelectionQuery.namedChild(BASELINE_AGGREGATION_VALUE))
             .findAny()
-            .isPresent());
+            .isPresent(),
+        field.getAlias());
   }
 
   private Optional<AttributeModelMetricAggregationType> getAggregationTypeForField(
@@ -181,9 +191,14 @@ private static class DefaultMetricAggregationRequest implements MetricAggregatio
     AttributeModelMetricAggregationType aggregation;
     List<Object> arguments;
     boolean baseline;
+    String alias;
 
     @Override
     public String alias() {
+      if (alias != null) {
+        return alias;
+      }
+
       return String.format(
           "%s_%s_%s",
           this.aggregation.name(),

hypertrace-graphql-metric-schema/src/main/java/org/hypertrace/graphql/metric/request/MetricAggregationRequestBuilder.java

@@ -24,4 +24,10 @@ MetricAggregationRequest build(
       AttributeAssociation<AttributeExpression> attributeExpressionAssociation,
       AttributeModelMetricAggregationType aggregationType,
       List<Object> arguments);
+
+  MetricAggregationRequest build(
+      AttributeAssociation<AttributeExpression> attributeExpressionAssociation,
+      AttributeModelMetricAggregationType aggregationType,
+      List<Object> arguments,
+      String alias);
 }