Repository: hive Updated Branches: refs/heads/master 284859c4e -> bb7153f9b
HIVE-11366: Avoid right leaning tree hashCode depth in ExprNodeDescEqualityWrapper hashmaps (Gopal V, reviewed by Ashutosh Chauhan) Project: http://git-wip-us.apache.org/repos/asf/hive/repo Commit: http://git-wip-us.apache.org/repos/asf/hive/commit/3e63fc42 Tree: http://git-wip-us.apache.org/repos/asf/hive/tree/3e63fc42 Diff: http://git-wip-us.apache.org/repos/asf/hive/diff/3e63fc42 Branch: refs/heads/master Commit: 3e63fc42054e64455d90ca74cb6ebe30ea0d40ae Parents: 284859c Author: Gopal V <gop...@apache.org> Authored: Tue Aug 25 14:14:08 2015 -0700 Committer: Gopal V <gop...@apache.org> Committed: Tue Aug 25 14:14:08 2015 -0700 ---------------------------------------------------------------------- .../org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hive/blob/3e63fc42/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java ---------------------------------------------------------------------- diff --git a/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java b/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java index 0fe9eda..15267b9 100755 --- a/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java +++ b/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java @@ -98,21 +98,22 @@ public abstract class ExprNodeDesc implements Serializable, Node { // This wraps an instance of an ExprNodeDesc, and makes equals work like isSame, see comment on // isSame - public static class ExprNodeDescEqualityWrapper { - private ExprNodeDesc exprNodeDesc; + public final static class ExprNodeDescEqualityWrapper { + private final ExprNodeDesc exprNodeDesc; + // beware of any implementation whose hashcode is mutable by reference + // inserting into a Map and then changing the hashcode can make it + // disappear out of the Map during lookups + private final int hashcode; public ExprNodeDescEqualityWrapper(ExprNodeDesc exprNodeDesc) { this.exprNodeDesc = exprNodeDesc; + this.hashcode = exprNodeDesc == null ? 0 : exprNodeDesc.hashCode(); } public ExprNodeDesc getExprNodeDesc() { return exprNodeDesc; } - public void setExprNodeDesc(ExprNodeDesc exprNodeDesc) { - this.exprNodeDesc = exprNodeDesc; - } - @Override public boolean equals(Object other) { @@ -125,7 +126,7 @@ public abstract class ExprNodeDesc implements Serializable, Node { @Override public int hashCode() { - return exprNodeDesc == null ? 0 : exprNodeDesc.hashCode(); + return hashcode; } /* helper function to allow Set()/Collection() operations with ExprNodeDesc */
