initial 23.6

.clang-format

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+BasedOnStyle: WebKit
+Language: Cpp
+AlignAfterOpenBracket: AlwaysBreak
+BreakBeforeBraces: Custom
+BraceWrapping:
+    AfterClass: true
+    AfterControlStatement: true
+    AfterEnum: true
+    AfterFunction: true
+    AfterNamespace: true
+    AfterStruct: true
+    AfterUnion: true
+    BeforeCatch: true
+    BeforeElse: true
+    BeforeLambdaBody: true
+    IndentBraces: false
+BreakConstructorInitializersBeforeComma: false
+Cpp11BracedListStyle: true
+ColumnLimit: 140
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ExperimentalAutoDetectBinPacking: true
+UseTab: Never
+TabWidth: 4
+Standard: Cpp11
+PointerAlignment: Middle
+MaxEmptyLinesToKeep: 2
+KeepEmptyLinesAtTheStartOfBlocks: false
+AllowShortFunctionsOnASingleLine: InlineOnly
+AlwaysBreakTemplateDeclarations: true
+IndentCaseLabels: true
+SpaceAfterTemplateKeyword: true
+SpaceBeforeCpp11BracedList: false
+SortIncludes: true
+IndentPPDirectives: AfterHash
+IncludeCategories:
+  - Regex: '^<[a-z_]+>'
+    Priority: 1
+  - Regex: '^<[a-z_]+.h>'
+    Priority: 2
+  - Regex: '^["<](common|ext|mysqlxx|daemon|zkutil)/'
+    Priority: 90
+  - Regex: '^["<](DB)/'
+    Priority: 100
+  - Regex: '^["<](Poco)/'
+    Priority: 50
+  - Regex: '^"'
+    Priority: 110
+  - Regex: '/'
+    Priority: 30
+  - Regex: '.*'
+    Priority: 40
+ReflowComments: false
+AlignEscapedNewlinesLeft: false
+AlignEscapedNewlines: DontAlign
+AlignTrailingComments: false
+
+# Not changed:
+AccessModifierOffset: -4
+AlignConsecutiveAssignments: false
+AlignOperands: false
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+BinPackArguments: false
+BinPackParameters: false
+BreakBeforeBinaryOperators: All
+BreakBeforeTernaryOperators: true
+CommentPragmas: '^ IWYU pragma:'
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+DerivePointerAlignment: false
+DisableFormat: false
+IndentRequiresClause: false
+IndentWidth: 4
+IndentWrappedFunctionNames: false
+MacroBlockBegin: ''
+MacroBlockEnd: ''
+NamespaceIndentation: Inner
+ObjCBlockIndentWidth: 4
+ObjCSpaceAfterProperty: true
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false

.clang-tidy

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+# To run clang-tidy from CMake, build ClickHouse with -DENABLE_CLANG_TIDY=1. To show all warnings, it is
+# recommended to pass "-k0" to Ninja.
+
+# Enable all checks + disable selected checks. Feel free to remove disabled checks from below list if
+# a) the new check is not controversial (this includes many checks in readability-* and google-*) or
+# b) too noisy (checks with > 100 new warnings are considered noisy, this includes e.g. cppcoreguidelines-*).
+
+# TODO Let clang-tidy check headers in further directories
+#      --> HeaderFilterRegex: '^.*/(src|base|programs|utils)/.*(h|hpp)$'
+HeaderFilterRegex: '^.*/(base)/.*(h|hpp)$'
+
+Checks: '*,
+    -abseil-*,
+
+    -altera-*,
+
+    -android-*,
+
+    -bugprone-assignment-in-if-condition,
+    -bugprone-branch-clone,
+    -bugprone-easily-swappable-parameters,
+    -bugprone-exception-escape,
+    -bugprone-implicit-widening-of-multiplication-result,
+    -bugprone-narrowing-conversions,
+    -bugprone-not-null-terminated-result,
+    -bugprone-reserved-identifier, # useful but too slow, TODO retry when https://reviews.llvm.org/rG1c282052624f9d0bd273bde0b47b30c96699c6c7 is merged
+    -bugprone-unchecked-optional-access,
+
+    -cert-dcl16-c,
+    -cert-dcl37-c,
+    -cert-dcl51-cpp,
+    -cert-err58-cpp,
+    -cert-msc32-c,
+    -cert-msc51-cpp,
+    -cert-oop54-cpp,
+    -cert-oop57-cpp,
+
+    -clang-analyzer-optin.performance.Padding,
+    -clang-analyzer-optin.portability.UnixAPI,
+    -clang-analyzer-security.insecureAPI.bzero,
+    -clang-analyzer-security.insecureAPI.strcpy,
+
+    -cppcoreguidelines-avoid-c-arrays,
+    -cppcoreguidelines-avoid-const-or-ref-data-members,
+    -cppcoreguidelines-avoid-do-while,
+    -cppcoreguidelines-avoid-goto,
+    -cppcoreguidelines-avoid-magic-numbers,
+    -cppcoreguidelines-avoid-non-const-global-variables,
+    -cppcoreguidelines-explicit-virtual-functions,
+    -cppcoreguidelines-init-variables,
+    -cppcoreguidelines-interfaces-global-init,
+    -cppcoreguidelines-macro-usage,
+    -cppcoreguidelines-narrowing-conversions,
+    -cppcoreguidelines-no-malloc,
+    -cppcoreguidelines-non-private-member-variables-in-classes,
+    -cppcoreguidelines-owning-memory,
+    -cppcoreguidelines-prefer-member-initializer,
+    -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
+    -cppcoreguidelines-pro-bounds-constant-array-index,
+    -cppcoreguidelines-pro-bounds-pointer-arithmetic,
+    -cppcoreguidelines-pro-type-const-cast,
+    -cppcoreguidelines-pro-type-cstyle-cast,
+    -cppcoreguidelines-pro-type-member-init,
+    -cppcoreguidelines-pro-type-reinterpret-cast,
+    -cppcoreguidelines-pro-type-static-cast-downcast,
+    -cppcoreguidelines-pro-type-union-access,
+    -cppcoreguidelines-pro-type-vararg,
+    -cppcoreguidelines-slicing,
+    -cppcoreguidelines-special-member-functions,
+
+    -darwin-*,
+
+    -fuchsia-*,
+
+    -google-build-using-namespace,
+    -google-readability-braces-around-statements,
+    -google-readability-casting,
+    -google-readability-function-size,
+    -google-readability-namespace-comments,
+    -google-readability-todo,
+    -google-upgrade-googletest-case,
+
+    -hicpp-avoid-c-arrays,
+    -hicpp-avoid-goto,
+    -hicpp-braces-around-statements,
+    -hicpp-explicit-conversions,
+    -hicpp-function-size,
+    -hicpp-member-init,
+    -hicpp-move-const-arg,
+    -hicpp-multiway-paths-covered,
+    -hicpp-named-parameter,
+    -hicpp-no-array-decay,
+    -hicpp-no-assembler,
+    -hicpp-no-malloc,
+    -hicpp-signed-bitwise,
+    -hicpp-special-member-functions,
+    -hicpp-uppercase-literal-suffix,
+    -hicpp-use-auto,
+    -hicpp-use-emplace,
+    -hicpp-vararg,
+
+    -linuxkernel-*,
+
+    -llvm-*,
+
+    -llvmlibc-*,
+
+    -openmp-*,
+
+    -misc-const-correctness,
+    -misc-no-recursion,
+    -misc-non-private-member-variables-in-classes,
+    -misc-confusable-identifiers, # useful but slooow
+    -misc-use-anonymous-namespace,
+
+    -modernize-avoid-c-arrays,
+    -modernize-concat-nested-namespaces,
+    -modernize-macro-to-enum,
+    -modernize-pass-by-value,
+    -modernize-return-braced-init-list,
+    -modernize-use-auto,
+    -modernize-use-default-member-init,
+    -modernize-use-emplace,
+    -modernize-use-nodiscard,
+    -modernize-use-override,
+    -modernize-use-trailing-return-type,
+
+    -performance-inefficient-string-concatenation,
+    -performance-no-int-to-ptr,
+    -performance-unnecessary-value-param,
+
+    -portability-simd-intrinsics,
+
+    -readability-braces-around-statements,
+    -readability-convert-member-functions-to-static,
+    -readability-else-after-return,
+    -readability-function-cognitive-complexity,
+    -readability-function-size,
+    -readability-identifier-length,
+    -readability-identifier-naming, # useful but too slow
+    -readability-implicit-bool-conversion,
+    -readability-isolate-declaration,
+    -readability-magic-numbers,
+    -readability-named-parameter,
+    -readability-redundant-declaration,
+    -readability-simplify-boolean-expr,
+    -readability-static-accessed-through-instance,
+    -readability-suspicious-call-argument,
+    -readability-uppercase-literal-suffix,
+    -readability-use-anyofallof,
+
+    -zircon-*,
+'
+
+WarningsAsErrors: '*'
+
+CheckOptions:
+  readability-identifier-naming.ClassCase: CamelCase
+  readability-identifier-naming.EnumCase: CamelCase
+  readability-identifier-naming.LocalVariableCase: lower_case
+  readability-identifier-naming.StaticConstantCase: aNy_CasE
+  readability-identifier-naming.MemberCase: lower_case
+  readability-identifier-naming.PrivateMemberPrefix: ''
+  readability-identifier-naming.ProtectedMemberPrefix: ''
+  readability-identifier-naming.PublicMemberCase: lower_case
+  readability-identifier-naming.MethodCase: camelBack
+  readability-identifier-naming.PrivateMethodPrefix: ''
+  readability-identifier-naming.ProtectedMethodPrefix: ''
+  readability-identifier-naming.ParameterPackCase: lower_case
+  readability-identifier-naming.StructCase: CamelCase
+  readability-identifier-naming.TemplateTemplateParameterCase: CamelCase
+  readability-identifier-naming.TemplateParameterCase: lower_case
+  readability-identifier-naming.TypeTemplateParameterCase: CamelCase
+  readability-identifier-naming.TypedefCase: CamelCase
+  readability-identifier-naming.UnionCase: CamelCase
+  modernize-loop-convert.UseCxx20ReverseRanges: false
+  performance-move-const-arg.CheckTriviallyCopyableMove: false
+  # Workaround clang-tidy bug: https://github.com/llvm/llvm-project/issues/46097
+  readability-identifier-naming.TypeTemplateParameterIgnoredRegexp: expr-type
+  cppcoreguidelines-avoid-do-while.IgnoreMacros: true

.clangd

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+Diagnostics:
+    # clangd does parse .clang-tidy, but some checks are too slow to run in
+    # clang-tidy build, so let's enable them explicitly for clangd at least.
+    ClangTidy:
+        # The following checks had been disabled due to slowliness with C++23,
+        # for more details see [1].
+        #
+        #   [1]: https://github.com/llvm/llvm-project/issues/61418
+        #
+        # But the code base had been written in a style that had been checked
+        # by this check, so at least, let's enable it for clangd.
+        Add: [
+            # configured in .clang-tidy
+            readability-identifier-naming,
+            bugprone-reserved-identifier,
+        ]

.editorconfig

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+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*.{c,cpp,cxx,h,hpp,hxx,py,cmake}]
+charset = utf-8
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[CMakeLists.txt]
+charset = utf-8
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true

.exrc

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+au BufRead,BufNewFile * set tabstop=4 softtabstop=0 expandtab shiftwidth=4 smarttab tags=tags,../tags

.git-blame-ignore-revs

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+# This is a file that can be used by git-blame to ignore some revisions.
+# (git 2.23+, released in August 2019)
+#
+# Can be configured as follow:
+#
+#     $ git config blame.ignoreRevsFile .git-blame-ignore-revs
+#
+# For more information you can look at git-blame(1) man page.
+
+# Changed tabs to spaces in code [#CLICKHOUSE-3]
+137ad95929ee016cc6d3c03bccb5586941c163ff
+
+# dbms/ → src/
+# (though it is unlikely that you will see it in blame)
+06446b4f08a142d6f1bc30664c47ded88ab51782

.gitattributes

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+contrib/* linguist-vendored
+*.h linguist-language=C++
+tests/queries/0_stateless/data_json/* binary
+tests/queries/0_stateless/*.reference -crlf

.github/CODEOWNERS

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+

.github/ISSUE_TEMPLATE/10_question.md

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+---
+name: Question
+about: Ask a question about ClickHouse
+title: ''
+labels: question
+assignees: ''
+
+---
+
+> Make sure to check documentation https://clickhouse.com/docs/en/ first. If the question is concise and probably has a short answer, asking it in [community Slack](https://join.slack.com/t/clickhousedb/shared_invite/zt-1gh9ds7f4-PgDhJAaF8ad5RbWBAAjzFg) is probably the fastest way to find the answer. For more complicated questions, consider asking them on StackOverflow with "clickhouse" tag https://stackoverflow.com/questions/tagged/clickhouse 
+
+> If you still prefer GitHub issues, remove all this text and ask your question here.

.github/ISSUE_TEMPLATE/20_feature-request.md

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+---
+name: Feature request
+about: Suggest an idea for ClickHouse
+title: ''
+labels: feature
+assignees: ''
+
+---
+
+> (you don't have to strictly follow this form)
+
+**Use case**
+
+> A clear and concise description of what is the intended usage scenario is.
+
+**Describe the solution you'd like**
+
+> A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+
+> A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+
+> Add any other context or screenshots about the feature request here.