Add support for dense_vector in PositionToXContent and EsqlQueryResponseTests

Author: carlosdelest

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/PositionToXContent.java

@@ -76,7 +76,7 @@ protected XContentBuilder valueToXContent(XContentBuilder builder, ToXContent.Pa
                     return builder.value(((IntBlock) block).getInt(valueIndex));
                 }
             };
-            case DOUBLE, COUNTER_DOUBLE -> new PositionToXContent(block) {
+            case DOUBLE, COUNTER_DOUBLE, DENSE_VECTOR -> new PositionToXContent(block) {
                 @Override
                 protected XContentBuilder valueToXContent(XContentBuilder builder, ToXContent.Params params, int valueIndex)
                     throws IOException {
@@ -182,13 +182,6 @@ protected XContentBuilder valueToXContent(XContentBuilder builder, ToXContent.Pa
                     }
                 }
             };
-            case DENSE_VECTOR -> new PositionToXContent(block) {
-                @Override
-                protected XContentBuilder valueToXContent(XContentBuilder builder, ToXContent.Params params, int valueIndex)
-                    throws IOException {
-                    return builder.value(((DoubleBlock) block).getDouble(valueIndex));
-                }
-            };
             case DATE_PERIOD, TIME_DURATION, DOC_DATA_TYPE, TSID_DATA_TYPE, SHORT, BYTE, OBJECT, FLOAT, HALF_FLOAT, SCALED_FLOAT,
                 PARTIAL_AGG -> throw new IllegalArgumentException("can't convert values of type [" + columnInfo.type() + "]");
         };

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/action/EsqlQueryResponseTests.java

@@ -993,10 +993,19 @@ static Page valuesToPage(BlockFactory blockFactory, List<ColumnInfoImpl> columns
                         aggBuilder.sum().appendDouble(((Number) value).doubleValue());
                         aggBuilder.count().appendInt(((Number) value).intValue());
                     }
+                    case DENSE_VECTOR -> {
+                        DoubleBlock.Builder doubleBuilder = (DoubleBlock.Builder) builder;
+                        @SuppressWarnings("unchecked")
+                        List<Double> vector = (List<Double>) value;
+                        doubleBuilder.beginPositionEntry();
+                        for (Double v : vector) {
+                            doubleBuilder.appendDouble(v);
+                        }
+                        doubleBuilder.endPositionEntry();
+                    }
                 }
             }
         }
         return new Page(results.stream().map(Block.Builder::build).toArray(Block[]::new));
     }
-
 }