[GitHub] [arrow] pitrou commented on a change in pull request #10184: ARROW-12568: [C++][Compute] Fix nullptr deference when array contains no nulls

[GitBox <gi...@apache.org>]

pitrou commented on a change in pull request #10184:
URL: https://github.com/apache/arrow/pull/10184#discussion_r624976026



##########
File path: cpp/src/arrow/compute/kernels/scalar_boolean.cc
##########
@@ -379,15 +397,24 @@ struct KleeneAndNot {
     }
 
     if (left_true) {
-      GetBitmap(*out, 0).CopyFrom(GetBitmap(right, 0));
+      if (right.GetNullCount() == 0) {
+        GetBitmap(*out, 0).SetBitsTo(true);

Review comment:
       And here.

##########
File path: cpp/src/arrow/compute/kernels/scalar_boolean.cc
##########
@@ -175,15 +175,24 @@ struct KleeneAnd : Commutative<KleeneAnd> {
     }
 
     if (right_true) {
-      GetBitmap(*out, 0).CopyFrom(GetBitmap(left, 0));
+      if (left.GetNullCount() == 0) {
+        GetBitmap(*out, 0).SetBitsTo(true);

Review comment:
       How about instead:
   ```c++
   out->null_count = 0;
   out->buffers[0] = nullptr;
   ```

##########
File path: cpp/src/arrow/compute/kernels/scalar_boolean.cc
##########
@@ -266,15 +275,24 @@ struct KleeneOr : Commutative<KleeneOr> {
     }
 
     if (right_false) {
-      GetBitmap(*out, 0).CopyFrom(GetBitmap(left, 0));
+      if (left.GetNullCount() == 0) {
+        GetBitmap(*out, 0).SetBitsTo(true);

Review comment:
       Same here.




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