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Commit Graph

13 Commits

Author SHA1 Message Date
02b8ea1331 feat(PP,ByteStream): new counting memory allocator 2025-03-27 22:12:48 +00:00
0ab03c7258 chore(codestyle): mark virtual methods as override 2025-02-21 20:01:34 +04:00
6f6e69815d feat(bytestream,serdes): Distribute BS buf size data type change to avoid implicit data type narrowing 2024-11-08 16:28:51 +04:00
b53c231ca6 MCOL-271 empty strings should not be NULLs (#2794)
This patch improves handling of NULLs in textual fields in ColumnStore.
Previously empty strings were considered NULLs and it could be a problem
if data scheme allows for empty strings. It was also one of major
reasons of behavior difference between ColumnStore and other engines in
MariaDB family.

Also, this patch fixes some other bugs and incorrect behavior, for
example, incorrect comparison for "column <= ''" which evaluates to
constant True for all purposes before this patch.
2023-03-30 21:18:29 +03:00
53b9a2a0f9 MCOL-4580 extent elimination for dictionary-based text/varchar types
The idea is relatively simple - encode prefixes of collated strings as
integers and use them to compute extents' ranges. Then we can eliminate
extents with strings.

The actual patch does have all the code there but miss one important
step: we do not keep collation index, we keep charset index. Because of
this, some of the tests in the bugfix suite fail and thus main
functionality is turned off.

The reason of this patch to be put into PR at all is that it contains
changes that made CHAR/VARCHAR columns unsigned. This change is needed in
vectorization work.
2022-03-02 23:53:39 +03:00
04752ec546 clang format apply 2022-01-21 16:43:49 +00:00
01f3ceb437 replace header guards with #pragma once 2022-01-21 15:24:58 +00:00
9794f24369 MCOL-4801 Replace Row methods getStringLength() and getStringPointer() to getConstString() 2021-07-06 21:15:32 +04:00
765858bc5b MCOL-4498 LIKE is not collation aware 2021-03-22 20:42:01 +04:00
11ba12f6ea MCOL-3536 collation 2020-05-19 16:22:44 -05:00
4b9d046c6e Fully resolve potentially ambiguous symbols by removing using namespace statements from headers which have a cascading effect. This causes potential behavior changes when switching to c++11 since symbols can be exported from std and boost while both have been imported into the global namespace. 2019-04-29 01:21:15 -05:00
01446d1e22 Reformat all code to coding standard 2017-10-26 17:18:17 +01:00
f6afc42dd0 the begginning 2016-01-06 14:08:59 -06:00