Add some comments.

Signed-off-by: RinChanNOWWW <rinchannow@bupt.edu.cn>
pingcap · Jul 25, 2022 · 602639b · 602639b
1 parent b849612
commit 602639b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/dbms/src/Flash/Coprocessor/DAGExpressionAnalyzer.cpp b/dbms/src/Flash/Coprocessor/DAGExpressionAnalyzer.cpp
@@ -169,6 +169,8 @@ void DAGExpressionAnalyzer::fillArgumentDetailForAggFuncBitwise(
     const Block & sample_block = actions->getSampleBlock();
     String name = getActions(arg, actions);
     DataTypePtr orig_type = sample_block.getByName(name).type;
+    // Bitwise operations can only be applied to integer types.
+    // So we need to cast the argument to UInt64.
     if (!removeNullable(orig_type)->equals(*uint64_type))
     {
         if (orig_type->isNullable())