Backport #12275 to 20.5: Supertype for LowCardinality #12370
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This will help with tracking possible issues, when you need to know was buffer released or not.
Before this patch isStalled() was checked before polledDataUnusable(), and after DROP TABLE isStalled() == true (although this looks tricky).
As stated by @filimonov it is not relevant (after #11599)
Fix limiting the number of threads for VIEW.
Enable CodeQL security scanner
Dockerfile security check for `clickhouse-server`
Exclude partition key columns from SummingMergeTree
Initial explain
Fix minor issues in ternary logic
Added performance test to resemble "questionable" benchmark
throw exception on redirect limit in S3 request
Polymorphic parts (in-memory format)
Added a test for PaddedPODArray just in case
Supertype for LowCardinality
…c3181104f911a9e8308c24242eb93 Cherry pick #12275 to 20.5: Supertype for LowCardinality
robot-clickhouse
added
the
pr-backport
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Original pull-request #12275
Cherry-pick pull-request #12359
This pull-request is a last step of an automated backporting.
Treat it as a standard pull-request: look at the checks and resolve conflicts.
Merge it only if you intend to backport changes to the target branch, otherwise just close it.