ESQL: Fix BasicBlockTests (#133743)

Closes #133596
Closes #133606
Closes #133608
Closes #133618
Closes #133621

Author: nik9000

muted-tests.yml

@@ -495,24 +495,9 @@ tests:
 - class: org.elasticsearch.xpack.esql.action.CrossClusterAsyncQueryStopIT
   method: testStopQueryLocal
   issue: https://github.com/elastic/elasticsearch/issues/133481
-- class: org.elasticsearch.compute.data.BasicBlockTests
-  method: testIntBlock
-  issue: https://github.com/elastic/elasticsearch/issues/133596
-- class: org.elasticsearch.compute.data.BasicBlockTests
-  method: testDoubleBlock
-  issue: https://github.com/elastic/elasticsearch/issues/133606
-- class: org.elasticsearch.compute.data.BasicBlockTests
-  method: testBooleanBlock
-  issue: https://github.com/elastic/elasticsearch/issues/133608
-- class: org.elasticsearch.compute.data.BasicBlockTests
-  method: testLongBlock
-  issue: https://github.com/elastic/elasticsearch/issues/133618
 - class: org.elasticsearch.xpack.esql.inference.rerank.RerankOperatorTests
   method: testSimpleCircuitBreaking
   issue: https://github.com/elastic/elasticsearch/issues/133619
-- class: org.elasticsearch.compute.data.BasicBlockTests
-  method: testFloatBlock
-  issue: https://github.com/elastic/elasticsearch/issues/133621
 - class: org.elasticsearch.xpack.esql.qa.single_node.GenerativeIT
   method: test
   issue: https://github.com/elastic/elasticsearch/issues/133077

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/data/BasicBlockTests.java

@@ -1784,10 +1784,13 @@ public static Block assertDeepCopy(Block block) {
         try (Block deepCopy = block.deepCopy(into)) {
             assertThat(deepCopy, equalTo(block));
 
-            assertThat(
-                deepCopy.asVector() != null && deepCopy.asVector().isConstant(),
-                equalTo(block.asVector() != null && block.asVector().isConstant())
-            );
+            if (block.asVector() != null && block.asVector().isConstant()) {
+                /*
+                 * If we were a constant, we will still be one. If we were not a constant,
+                 * deepCopy might make a constant in the rare case that we have a single element array.
+                 */
+                assertThat(deepCopy.asVector() != null && deepCopy.asVector().isConstant(), equalTo(true));
+            }
         }
         Block untracked = block.deepCopy(TestBlockFactory.getNonBreakingInstance());
         assertThat(untracked, equalTo(block));