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TCP converters 6b/6: write through the converter layer everywhere and delete the old write members - #677

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alex-clickhouse/converter-6a-delete-read-sidefrom

alex-clickhouse/converter-6b-write-reroute

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TCP converters 6b/6: write through the converter layer everywhere and delete the old write members#677
alex-clickhouse wants to merge 41 commits into
alex-clickhouse/converter-6a-delete-read-sidefrom
alex-clickhouse/converter-6b-write-reroute

Commits on Oct 11, 2026
- tests: pin the bytes of the writes of Dynamic, QBit, Tuple(), the geo types and dense arrays
  
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- converters: write Dynamic, QBit, Tuple() and the geo types through the converter layer
  
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  2eea3e7
- codecs: write from storage only the columns that a query reads
  
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  b04cf04
- insert: write a dense array through the element writer of its tree
  
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  9ecfd1d
- poco: ask the type whether the column holds NULL
  
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  e7d1faf
- tests: name the dense columns that the composite write arm gives to the codec
  
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  aa4c86f
- codecs: say which columns a codec writes from its storage
  
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  8a08eb8
- codecs: write the decoded leaf columns in bulk
  
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  249b04d
- converters: find a repeated LowCardinality value with a read-only lookup
  
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  2e88f58
- tests, docs: pin the re-insert of a decoded Nullable column into a related type
  
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  fe9b7f3
- benchmark: price the writes of Dynamic and of CreateArray columns
  
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  5e6b3e5
- tests: pin the refusals and the wire bytes that only the codec write pinned
  
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  7d49379
- tests: pin the LowCardinality entries of the stored DateTime and Time values
  
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  1bbabd6
- converters: write LowCardinality(UUID) and the other fixed-width dictionaries at the codec cost
  
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  cafb90d
- benchmark: price LowCardinality(UUID) and LowCardinality(UInt32) inserts
  
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  cadcede
- tests: remove the test layers that duplicate the client baseline
  
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  9e632e6
- tests: send the values that only the codec tests held to InsertRoundTripCase
  
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  232c702
- tests: pin the converter writes with literals, not with the codec write
  
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  c2a3d54
- codecs: write a column from its storage only, and delete the write members
  
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  38b9cf1
- docs: describe the wire layer and the converter layer for contributors
  
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  dd20222
- fix: write a decoded column from storage only when its type parameters match
  
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  f58e26f
- perf: cache whether a column type holds NULL
  
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  d4c8b1b
- fix: convert only the parts of a read column whose values mean other values
  
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  8686002
- docs: name DifferentialCases as the source of the differential read scenarios
  
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  e62855b
- style: comments that this part touched, without dashes or defect words
  
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  a9a5d5d
- fix: write a read String into another type of a string from its bytes
  
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  efeb6cf
- fix: write a value that a NULL hides with the placeholder of the target
  
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  2a16ffa
- perf: stop the CLR lookup of a LowCardinality dictionary at the deciding miss
  
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  1afd4c8
- style: say where the probe of a LowCardinality dictionary stops
  
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  4a7d8e5
- tests: pin a hidden value in a slice that does not start at row 0
  
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  2ea8242
- converters: a column with several failing rows throws the failure of one of them
  
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  ed17f24
- docs: the failure of a column with several failing values
  
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  fa52bcd
- tests: slim the differential fixture to direct tests over the case list
  
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  b1ab4cf
- tests: require the row inserts to give the outcome of the insert
  
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  f223b76
- tests: one rule for every tier and range of the differential tests
  
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  b4cc47f
- tests: compare a converter failure of a row insert with the insert's text
  
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  5251686
- tests: name the source row in a row insert's failure, not a masked number
  
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  eb76d2c
- tcp: state the bound of the Dynamic and HoldsNull caches past their limit
  
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  bb642d8
- fix: name the column in the block writer's refusal of a column of no single CLR type
  
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  da6fa8d
- tests: check that the nested Array samples hold values at every depth
  
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  1d53866
- codecs: name the storage check WritesFromStorage
  
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  f83c7ce

Commits

Commits on Oct 11, 2026