ExternalDictionaries: don't lock when checking if a dictionary is modified #4599
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Do we need this in any 19.1 or 19.3 versions, when it gets merged? |
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Yes. |
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For changelog. Remove if this is non-significant change.
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Short description (up to few sentences):
Avoid deadlock when the
invalidate_queryfor a dictionary withclickhousesource was involvingsystem.dictionariestable orDictionariesdatabase (rare case). This PR also fixes #4597.