YQ Connector: support managed ClickHouse

Со стороны dqrun можно обратиться к инстансу коннектора, который работает на streaming стенде, и извлечь данные из облачного CH.

1 files changed, 159 insertions, 0 deletions

diff --git a/contrib/libs/llvm14/include/llvm/ADT/CombinationGenerator.h b/contrib/libs/llvm14/include/llvm/ADT/CombinationGenerator.h
new file mode 100644
index 0000000000..35bdc781f3
--- /dev/null
+++ b/contrib/libs/llvm14/include/llvm/ADT/CombinationGenerator.h
@@ -0,0 +1,159 @@
+#pragma once
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+//===-- llvm/ADT/CombinationGenerator.h ------------------------*- C++ -*--===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Combination generator.
+///
+/// Example: given input {{0, 1}, {2}, {3, 4}} it will produce the following
+/// combinations: {0, 2, 3}, {0, 2, 4}, {1, 2, 3}, {1, 2, 4}.
+///
+/// It is useful to think of input as vector-of-vectors, where the
+/// outer vector is the variable space, and inner vector is choice space.
+/// The number of choices for each variable can be different.
+///
+/// As for implementation, it is useful to think of this as a weird number,
+/// where each digit (==variable) may have different base (==number of choices).
+/// Thus modelling of 'produce next combination' is exactly analogous to the
+/// incrementing of an number - increment lowest digit (pick next choice for the
+/// variable), and if it wrapped to the beginning then increment next digit.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_COMBINATIONGENERATOR_H
+#define LLVM_ADT_COMBINATIONGENERATOR_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLFunctionalExtras.h"
+#include "llvm/ADT/SmallVector.h"
+#include <cassert>
+#include <cstring>
+
+namespace llvm {
+
+template <typename choice_type, typename choices_storage_type,
+          int variable_smallsize>
+class CombinationGenerator {
+  template <typename T> struct WrappingIterator {
+    using value_type = T;
+
+    const ArrayRef<value_type> Range;
+    typename decltype(Range)::const_iterator Position;
+
+    // Rewind the tape, placing the position to again point at the beginning.
+    void rewind() { Position = Range.begin(); }
+
+    // Advance position forward, possibly wrapping to the beginning.
+    // Returns whether the wrap happened.
+    bool advance() {
+      ++Position;
+      bool Wrapped = Position == Range.end();
+      if (Wrapped)
+        rewind();
+      return Wrapped;
+    }
+
+    // Get the value at which we are currently pointing.
+    const value_type &operator*() const { return *Position; }
+
+    WrappingIterator(ArrayRef<value_type> Range_) : Range(Range_) {
+      assert(!Range.empty() && "The range must not be empty.");
+      rewind();
+    }
+  };
+
+  const ArrayRef<choices_storage_type> VariablesChoices;
+
+  void performGeneration(
+      const function_ref<bool(ArrayRef<choice_type>)> Callback) const {
+    SmallVector<WrappingIterator<choice_type>, variable_smallsize>
+        VariablesState;
+
+    // 'increment' of the the whole VariablesState is defined identically to the
+    // increment of a number: starting from the least significant element,
+    // increment it, and if it wrapped, then propagate that carry by also
+    // incrementing next (more significant) element.
+    auto IncrementState =
+        [](MutableArrayRef<WrappingIterator<choice_type>> VariablesState)
+        -> bool {
+      for (WrappingIterator<choice_type> &Variable :
+           llvm::reverse(VariablesState)) {
+        bool Wrapped = Variable.advance();
+        if (!Wrapped)
+          return false; // There you go, next combination is ready.
+        // We have carry - increment more significant variable next..
+      }
+      return true; // MSB variable wrapped, no more unique combinations.
+    };
+
+    // Initialize the per-variable state to refer to the possible choices for
+    // that variable.
+    VariablesState.reserve(VariablesChoices.size());
+    for (ArrayRef<choice_type> VC : VariablesChoices)
+      VariablesState.emplace_back(VC);
+
+    // Temporary buffer to store each combination before performing Callback.
+    SmallVector<choice_type, variable_smallsize> CurrentCombination;
+    CurrentCombination.resize(VariablesState.size());
+
+    while (true) {
+      // Gather the currently-selected variable choices into a vector.
+      for (auto I : llvm::zip(VariablesState, CurrentCombination))
+        std::get<1>(I) = *std::get<0>(I);
+      // And pass the new combination into callback, as intended.
+      if (/*Abort=*/Callback(CurrentCombination))
+        return;
+      // And tick the state to next combination, which will be unique.
+      if (IncrementState(VariablesState))
+        return; // All combinations produced.
+    }
+  };
+
+public:
+  CombinationGenerator(ArrayRef<choices_storage_type> VariablesChoices_)
+      : VariablesChoices(VariablesChoices_) {
+#ifndef NDEBUG
+    assert(!VariablesChoices.empty() && "There should be some variables.");
+    llvm::for_each(VariablesChoices, [](ArrayRef<choice_type> VariableChoices) {
+      assert(!VariableChoices.empty() &&
+             "There must always be some choice, at least a placeholder one.");
+    });
+#endif
+  }
+
+  // How many combinations can we produce, max?
+  // This is at most how many times the callback will be called.
+  size_t numCombinations() const {
+    size_t NumVariants = 1;
+    for (ArrayRef<choice_type> VariableChoices : VariablesChoices)
+      NumVariants *= VariableChoices.size();
+    assert(NumVariants >= 1 &&
+           "We should always end up producing at least one combination");
+    return NumVariants;
+  }
+
+  // Actually perform exhaustive combination generation.
+  // Each result will be passed into the callback.
+  void generate(const function_ref<bool(ArrayRef<choice_type>)> Callback) {
+    performGeneration(Callback);
+  }
+};
+
+} // namespace llvm
+
+#endif
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif