Add assertion to check correct type

carlosdelest · carlosdelest · commit 8e7a8354ef36 · 2025-01-27T11:02:37.000+01:00
diff --git a/x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneQueryExpressionEvaluator.java b/x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneQueryExpressionEvaluator.java
@@ -56,7 +56,9 @@ public LuceneQueryExpressionEvaluator(BlockFactory blockFactory, ShardConfig[] s
     @Override
     public Block eval(Page page) {
         // Lucene based operators retrieve DocVectors as first block
-        DocVector docs = page.<DocBlock>getBlock(0).asVector();
+        Block block = page.getBlock(0);
+        assert block instanceof DocBlock : "LuceneQueryExpressionEvaluator expects DocBlock as input";
+        DocVector docs = (DocVector) block.asVector();
         try {
             if (docs.singleSegmentNonDecreasing()) {
                 return evalSingleSegmentNonDecreasing(docs).asBlock();
