optimize many_numbers test

Author: jan-elastic

x-pack/plugin/esql/qa/testFixtures/src/main/resources/approximate.csv-spec

@@ -1,4 +1,10 @@
 // Tests focused on query approximation.
+//
+// The data set "many_numbers" contains 10,000 rows with a multi-valued field
+// "value" containing 550 integers each. Aggregated all over rows, there are
+// 1x1, 2x2, ..., 999x999 and 1000x1000. It's not one number per row, because
+// that's too slow to ingest.
+//
 // Note: this tests only basic behavior, because of limitations of the CSV tests.
 // Most tests assert that the count, average and sum of some values are within a
 // range. All ranges are very loose, so that the tests should practically never fail.
@@ -10,6 +16,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | STATS count=COUNT(), avg=AVG(value), sum=SUM(value)
     | EVAL is_expected = count >= 450000 AND count <= 550000 AND
                          avg >= 600 AND avg <= 750 AND
@@ -27,6 +34,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | WHERE value <= 25
     | STATS count=COUNT(), avg=AVG(value), sum=SUM(value)
 ;
@@ -41,6 +49,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | WHERE value >= 500
     | STATS count=COUNT(), avg=AVG(value), sum=SUM(value)
     | EVAL is_expected = count >= 300000 AND count <= 450000 AND
@@ -59,6 +68,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | STATS count=COUNT() WHERE value >= 500,
             avg=AVG(value) WHERE value >= 500,
             sum=SUM(value) WHERE value >= 500
@@ -78,6 +88,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | SAMPLE 0.5
     | STATS count=COUNT(), avg=AVG(value), sum=SUM(value)
     | EVAL is_expected = count >= 200000 AND count <= 300000 AND
@@ -96,6 +107,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | EVAL value2 = 2 * value
     | DROP value
     | SORT value2 DESC
@@ -123,6 +135,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | STATS count=COUNT(), avg=AVG(value), sum=SUM(value)
     | EVAL avg2 = 2 * avg
     | LIMIT 10
@@ -144,6 +157,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | STATS count=COUNT() BY value
     | SORT value DESC
     | LIMIT 5
@@ -165,6 +179,7 @@ required_capability: approximate
 approximate: true
 
 FROM many_numbers
+    | MV_EXPAND value
     | WHERE value <= 5
     | STATS count=COUNT() BY value
     | SORT value