[feat](catalog) support ADBC catalog that reads external sources over Arrow - #66331

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morningman:wt-adbc-catalog

Commits on Aug 2, 2026

[feat](adbc) link adbc_driver_manager into doris_be

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[feat](adbc) normalize third-party arrow variants for Doris serdes

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[feat](adbc) add process-wide ADBC driver registry

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[feat](adbc) add adbc_params to TTableFormatFileDesc

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[feat](adbc) add BE ADBC reader on the FileScannerV2 path

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[feat](adbc) route adbc scan ranges to FileScannerV2

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[feat](adbc) add fe-connector-adbc module skeleton and provider

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[feat](adbc) wire adbc into the FE build, deployment and config

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[feat](adbc) add adbc catalog properties and driver path resolution

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[feat](adbc) add the adbc client on the JNI driver bridge

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[feat](adbc) map ADBC getObjects and Arrow schemas onto Doris metadata

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[feat](adbc) implement adbc connector metadata operations

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[feat](adbc) map the arrow file format to BE's arrow reader

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[feat](adbc) generate pushed-down SQL through a registered dialect

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[feat](adbc) plan a scan into one range BE can read

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[feat](adbc) count rows when a scan projects no columns

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[test](adbc) add the adbc scan regression suite

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[test](adbc) add an end-to-end scan suite driven by the sqlite driver

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[fix](adbc) materialize an all-null column whatever type the source claims

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[test](adbc) install the prebuilt flight sql driver from thirdparty

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[fix](adbc) survive a driver that leaves its stream release callback set

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[fix](adbc) speak Doris's identifier quoting to a Doris source

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[feat](adbc) split a scan into the driver's partitions, one per backend

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[fix](connector) tell a connector when a plan will only be explained

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[test](adbc) check both planning paths return the same rows

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[feat](adbc) read one partition instead of running a statement

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[fix](adbc) keep the driver registry alive as long as its promise says

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[fix](build) build the adbc connector plugin, do not just deploy it

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[fix](adbc) say what the driver answered when partitioning is refused

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[feat](adbc) let a catalog forbid the partitioned-read downgrade

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[fix](adbc) drop what a source calls a view from the table listing

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[test](adbc) pin how many partitions a scan is split into

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[feat](adbc) remember the source's metadata between statements

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[fix](adbc) keep the listings the engine checks names against live

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[test](adbc) check what a catalog remembers and what forgets it

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[feat](adbc) verify the driver file is the build the catalog names

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[fix](adbc) say which dialect wrote the statement a source rejected

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[fix](connector) show the projection the scan will really ask for

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[fix](adbc) keep a zoned timestamp comparison out of the remote statement

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[test](adbc) add the end-to-end suites for a Doris Flight SQL source

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[feat](adbc) read the driver settings from the plugin conf

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