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branch-4.0:[fix](fe) Fix null pointer exception in sessionVariables after upgrade #61959 - #62896
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apache#61959) After upgrading from 4.0.2 to 4.0.4+, executing SHOW CREATE MATERIALIZED VIEW throws a NullPointerException. The root cause is that the sessionVariables field was newly added in MTMV.java after 4.0.2. In 4.0.2, materialized views did not persist this field, so after upgrade, the deserialized sessionVariables is null. However, ShowCreateMTMVInfo.java:93 directly calls mtmv.getSessionVariables().toString() without null pointer protection, causing NPE. Modified gsonPostProcess() method in 5 classes to initialize sessionVariables to empty HashMap during deserialization: - MTMV.java - Added null check for sessionVariables - View.java - Added null check for sessionVariables - AliasFunction.java - Implemented GsonPostProcessable and added null check - Column.java - Added null check for sessionVariables - MaterializedIndexMeta.java - Added null check for sessionVariables Fixed NullPointerException when executing SHOW CREATE MATERIALIZED VIEW after upgrading from version 4.0.2 to 4.0.4+. - Unit tests added (SessionVariablesNullFixTest) with comprehensive coverage - All existing tests pass - FE build successful Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
feiniaofeiafei
commented
Apr 28, 2026
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run buildall |
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feiniaofeiafei
commented
Apr 29, 2026
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run buildall |
feiniaofeiafei
commented
Apr 29, 2026
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run buildall |
yiguolei
commented
May 7, 2026
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skip buildall |
yiguolei
approved these changes
May 7, 2026
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PR approved by at least one committer and no changes requested. |
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PR approved by anyone and no changes requested. |
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picked from #61959