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new 14f64499ad7 [chore](nereids) update <=> comments (#34634)
14f64499ad7 is described below
commit 14f64499ad729d40b6a034cd8de28a1332c3ac07
Author: minghong <[email protected]>
AuthorDate: Sat May 11 16:09:56 2024 +0800
[chore](nereids) update <=> comments (#34634)
---
.../doris/nereids/rules/expression/rules/NullSafeEqualToEqual.java | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/NullSafeEqualToEqual.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/NullSafeEqualToEqual.java
index e8eedb1e198..dda109a42e0 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/NullSafeEqualToEqual.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/NullSafeEqualToEqual.java
@@ -31,8 +31,10 @@ import com.google.common.collect.ImmutableList;
import java.util.List;
/**
- * convert "<=>" to "=", if any side is not nullable
+ * convert "<=>" to "=", if both sides are not nullable
* convert "A <=> null" to "A is null"
+ * null <=> null : true
+ * null <=> 1 : false
*/
public class NullSafeEqualToEqual implements ExpressionPatternRuleFactory {
public static final NullSafeEqualToEqual INSTANCE = new
NullSafeEqualToEqual();
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