Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22602#discussion_r221809826
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/codegen/UnsafeRowWriter.java
---
@@ -185,13 +185,13 @@ public void write(int ordinal, Decimal input, int
precision, int scale) {
// grow the global buffer before writing data.
holder.grow(16);
+ // zero-out the bytes
--- End diff --
+1
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