Add Firebird - #3059
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Firebird 5.0.4 from the official release tarball, loaded with a small C++ loader using the batch API in embedded mode, with the PostgreSQL queries adapted to the Firebird dialect. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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In embedded mode the user defaults to the OS user (`firebird`), which has no rights on the table created by SYSDBA, so the first EC2 run failed with `no permission for SELECT access to TABLE HITS`. Calling `exit` from a failing thread also shut down the engine under the other threads, which then crashed; use `_exit` instead. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Adds Firebird 5.0.4, a row-oriented relational database, installed from the official release tarball (Ubuntu packages only Firebird 3.0), in the default SuperServer mode.
VARCHAR(n) CHARACTER SET NONE(raw bytes; the data has invalid UTF-8), sized just above the longest value of each column. Firebird limits the declared row size to 64 KB, and its sort, used for everyGROUP BYandORDER BY, padsVARCHARkeys to their declared length: on 1M rows, grouping by short values took 20.8 s asVARCHAR(100)and 490 s asVARCHAR(8000).COPY, and external tables need fixed-width records, soloader.cppparseshits.tsvand inserts with theIBatchAPI in embedded mode, with 4 threads (more were slower). A Python driver loop managed only 220 rows/s. Forced writes are off during the load and switched back on afterwards; the primary key(CounterID, EventDate, UserID, EventTime, WatchID)is added after the load using parallel workers.FETCH/OFFSETsyntax,CHAR_LENGTH,SUBSTRING ... SIMILARin place ofREGEXP_REPLACE(Q29),DATEADD/DATEDIFFin place ofDATE_TRUNC(Q43), andGROUP BYpositions instead of aliases.Expected: single-threaded queries; Q34 and Q35 (
GROUP BY URLover 100M rows, ~800 GB of 8 KB sort keys) should fail for lack of disk space.The official ARM64 binaries of 5.0.4 are built with
-p(gprof instrumentation;_mcounttook 40% of the load's CPU time). It was removed on Firebirdmasterin FirebirdSQL/firebird@5231e27746 but remains inv5.0-release; x86-64 is unaffected.Validated locally (aarch64, private server instance) on a 1M-row sample: load and primary key work, all queries run, and the answers of the rewritten Q29 and Q43 match clickhouse-local running the original queries. Timings on this host are not meaningful (contended disk).
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