Support 'start_pos' argument in 'position' function

src/Functions/FunctionsStringSearch.h

@@ -11,7 +11,6 @@
 #include <Functions/IFunctionImpl.h>
 #include <Interpreters/Context.h>
 
-
 namespace DB
 {
 /** Search and replace functions in strings:
@@ -51,15 +50,26 @@ public:
 
     String getName() const override { return name; }
 
-    size_t getNumberOfArguments() const override { return 2; }
+    bool isVariadic() const override {
+        return Impl::supports_start_pos;
+    }
+
+    size_t getNumberOfArguments() const override {
+        if (Impl::supports_start_pos) {
+            return 0;
+        }
+        return 2;
+    }
 
     bool useDefaultImplementationForConstants() const override { return Impl::use_default_implementation_for_constants; }
 
     ColumnNumbers getArgumentsThatAreAlwaysConstant() const override
     {
-        return Impl::use_default_implementation_for_constants
-            ? ColumnNumbers{1, 2}
-            : ColumnNumbers{};
+        if (!Impl::use_default_implementation_for_constants)
+            return ColumnNumbers{};
+        if (!Impl::supports_start_pos)
+            return ColumnNumbers{1, 2};
+        return ColumnNumbers{1, 2, 3};
     }
 
     DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
@@ -72,6 +82,13 @@ public:
             throw Exception(
                 "Illegal type " + arguments[1]->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
 
+        if (arguments.size() >= 3) {
+            if (!isUnsignedInteger(arguments[2])) {
+                throw Exception(
+                    "Illegal type " + arguments[2]->getName() + " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
+            }
+        }
+
         return std::make_shared<DataTypeNumber<typename Impl::ResultType>>();
     }
 
@@ -82,17 +99,36 @@ public:
         const ColumnPtr & column_haystack = block.getByPosition(arguments[0]).column;
         const ColumnPtr & column_needle = block.getByPosition(arguments[1]).column;
 
+        ColumnPtr column_start_pos = nullptr;
+        if (arguments.size() >= 3) {
+            column_start_pos = block.getByPosition(arguments[2]).column;
+        }
+
         const ColumnConst * col_haystack_const = typeid_cast<const ColumnConst *>(&*column_haystack);
         const ColumnConst * col_needle_const = typeid_cast<const ColumnConst *>(&*column_needle);
 
         if constexpr (!Impl::use_default_implementation_for_constants)
         {
+            bool is_col_start_pos_const = column_start_pos == nullptr || isColumnConst(*column_start_pos);
             if (col_haystack_const && col_needle_const)
             {
-                ResultType res{};
-                Impl::constantConstant(col_haystack_const->getValue<String>(), col_needle_const->getValue<String>(), res);
-                block.getByPosition(result).column
-                    = block.getByPosition(result).type->createColumnConst(col_haystack_const->size(), toField(res));
+                auto col_res = ColumnVector<ResultType>::create();
+                typename ColumnVector<ResultType>::Container & vec_res = col_res->getData();
+                vec_res.resize(is_col_start_pos_const ? 1 : column_start_pos->size());
+
+                Impl::constantConstant(
+                    col_haystack_const->getValue<String>(),
+                    col_needle_const->getValue<String>(),
+                    column_start_pos,
+                    vec_res);
+
+                if (is_col_start_pos_const) {
+                    block.getByPosition(result).column
+                        = block.getByPosition(result).type->createColumnConst(col_haystack_const->size(), toField(vec_res[0]));
+                } else {
+                    block.getByPosition(result).column = std::move(col_res);
+                }
+
                 return;
             }
         }
@@ -112,16 +148,28 @@ public:
                 col_haystack_vector->getOffsets(),
                 col_needle_vector->getChars(),
                 col_needle_vector->getOffsets(),
+                column_start_pos,
                 vec_res);
         else if (col_haystack_vector && col_needle_const)
             Impl::vectorConstant(
-                col_haystack_vector->getChars(), col_haystack_vector->getOffsets(), col_needle_const->getValue<String>(), vec_res);
+                col_haystack_vector->getChars(),
+                col_haystack_vector->getOffsets(),
+                col_needle_const->getValue<String>(),
+                column_start_pos,
+                vec_res);
         else if (col_haystack_vector_fixed && col_needle_const)
             Impl::vectorFixedConstant(
-                col_haystack_vector_fixed->getChars(), col_haystack_vector_fixed->getN(), col_needle_const->getValue<String>(), vec_res);
+                col_haystack_vector_fixed->getChars(),
+                col_haystack_vector_fixed->getN(),
+                col_needle_const->getValue<String>(),
+                vec_res);
         else if (col_haystack_const && col_needle_vector)
             Impl::constantVector(
-                col_haystack_const->getValue<String>(), col_needle_vector->getChars(), col_needle_vector->getOffsets(), vec_res);
+                col_haystack_const->getValue<String>(),
+                col_needle_vector->getChars(),
+                col_needle_vector->getOffsets(),
+                column_start_pos,
+                vec_res);
         else
             throw Exception(
                 "Illegal columns " + block.getByPosition(arguments[0]).column->getName() + " and "

src/Functions/FunctionsVisitParam.h

@@ -79,12 +79,19 @@ struct ExtractParamImpl
     using ResultType = typename ParamExtractor::ResultType;
 
     static constexpr bool use_default_implementation_for_constants = true;
+    static constexpr bool supports_start_pos = false;
 
     /// It is assumed that `res` is the correct size and initialized with zeros.
-    static void vectorConstant(const ColumnString::Chars & data, const ColumnString::Offsets & offsets,
+    static void vectorConstant(
+        const ColumnString::Chars & data,
+        const ColumnString::Offsets & offsets,
         std::string needle,
+        const ColumnPtr & start_pos,
         PaddedPODArray<ResultType> & res)
     {
+        if (start_pos != nullptr) {
+            throw Exception("Functions 'visitParamHas' and 'visitParamExtract*' doesn't support start_pos argument", ErrorCodes::ILLEGAL_COLUMN);
+        }
         /// We are looking for a parameter simply as a substring of the form "name"
         needle = "\"" + needle + "\":";
 

src/Functions/HasTokenImpl.h

@@ -19,10 +19,19 @@ struct HasTokenImpl
     using ResultType = UInt8;
 
     static constexpr bool use_default_implementation_for_constants = true;
+    static constexpr bool supports_start_pos = false;
 
     static void vectorConstant(
-        const ColumnString::Chars & data, const ColumnString::Offsets & offsets, const std::string & pattern, PaddedPODArray<UInt8> & res)
+        const ColumnString::Chars & data,
+        const ColumnString::Offsets & offsets,
+        const std::string & pattern,
+        const ColumnPtr & start_pos,
+        PaddedPODArray<UInt8> & res)
     {
+        if (start_pos != nullptr) {
+            throw Exception("Function 'hasToken' does not support start_pos argument", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
+        }
+
         if (offsets.empty())
             return;
 

src/Functions/MatchImpl.h

@@ -76,6 +76,7 @@ template <bool like, bool revert = false, bool case_insensitive = false>
 struct MatchImpl
 {
     static constexpr bool use_default_implementation_for_constants = true;
+    static constexpr bool supports_start_pos = false;
 
     using ResultType = UInt8;
 
@@ -84,8 +85,16 @@ struct MatchImpl
           VolnitskyUTF8>;
 
     static void vectorConstant(
-        const ColumnString::Chars & data, const ColumnString::Offsets & offsets, const std::string & pattern, PaddedPODArray<UInt8> & res)
+        const ColumnString::Chars & data,
+        const ColumnString::Offsets & offsets,
+        const std::string & pattern,
+        const ColumnPtr & start_pos,
+        PaddedPODArray<UInt8> & res)
     {
+        if (start_pos != nullptr) {
+            throw Exception("Functions 'like' and 'match' don't support start_pos argument", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
+        }
+
         if (offsets.empty())
             return;
 
@@ -238,7 +247,8 @@ struct MatchImpl
 
     /// Very carefully crafted copy-paste.
     static void vectorFixedConstant(
-        const ColumnString::Chars & data, size_t n, const std::string & pattern, PaddedPODArray<UInt8> & res)
+        const ColumnString::Chars & data, size_t n, const std::string & pattern,
+        PaddedPODArray<UInt8> & res)
     {
         if (data.empty())
             return;

src/Functions/PositionImpl.h

@@ -1,11 +1,11 @@
 #include "FunctionsStringSearch.h"
 
+#include <algorithm>
 #include <string>
 #include <vector>
 #include <Poco/UTF8String.h>
 #include <Common/Volnitsky.h>
 
-
 namespace DB
 {
 
@@ -42,6 +42,10 @@ struct PositionCaseSensitiveASCII
         return MultiSearcherInBigHaystack(needles);
     }
 
+    static const char * advancePos(const char * pos, const char * end, size_t n) {
+        return std::min(pos + n, end);
+    }
+
     /// Number of code points between 'begin' and 'end' (this has different behaviour for ASCII and UTF-8).
     static size_t countChars(const char * begin, const char * end) { return end - begin; }
 
@@ -73,6 +77,10 @@ struct PositionCaseInsensitiveASCII
         return MultiSearcherInBigHaystack(needles);
     }
 
+    static const char * advancePos(const char * pos, const char * end, size_t n) {
+        return std::min(pos + n, end);
+    }
+
     static size_t countChars(const char * begin, const char * end) { return end - begin; }
 
     static void toLowerIfNeed(std::string & s) { std::transform(std::begin(s), std::end(s), std::begin(s), tolower); }
@@ -100,6 +108,19 @@ struct PositionCaseSensitiveUTF8
         return MultiSearcherInBigHaystack(needles);
     }
 
+    static const char * advancePos(const char * pos, const char * end, size_t n)
+    {
+        for (auto it = pos; it != end; ++it) {
+            if (!UTF8::isContinuationOctet(static_cast<UInt8>(*it))) {
+                if (n == 0) {
+                    return it;
+                }
+                n--;
+            }
+        }
+        return end;
+    }
+
     static size_t countChars(const char * begin, const char * end)
     {
         size_t res = 0;
@@ -134,13 +155,16 @@ struct PositionCaseInsensitiveUTF8
         return MultiSearcherInBigHaystack(needles);
     }
 
+    static const char * advancePos(const char * pos, const char * end, size_t n)
+    {
+        // reuse implementation that doesn't depend on case
+        return PositionCaseSensitiveUTF8::advancePos(pos, end, n);
+    }
+
     static size_t countChars(const char * begin, const char * end)
     {
-        size_t res = 0;
-        for (auto it = begin; it != end; ++it)
-            if (!UTF8::isContinuationOctet(static_cast<UInt8>(*it)))
-                ++res;
-        return res;
+        // reuse implementation that doesn't depend on case
+        return PositionCaseSensitiveUTF8::countChars(begin, end);
     }
 
     static void toLowerIfNeed(std::string & s) { Poco::UTF8::toLowerInPlace(s); }
@@ -151,12 +175,17 @@ template <typename Impl>
 struct PositionImpl
 {
     static constexpr bool use_default_implementation_for_constants = false;
+    static constexpr bool supports_start_pos = true;
 
     using ResultType = UInt64;
 
     /// Find one substring in many strings.
     static void vectorConstant(
-        const ColumnString::Chars & data, const ColumnString::Offsets & offsets, const std::string & needle, PaddedPODArray<UInt64> & res)
+        const ColumnString::Chars & data,
+        const ColumnString::Offsets & offsets,
+        const std::string & needle,
+        const ColumnPtr & start_pos,
+        PaddedPODArray<UInt64> & res)
     {
         const UInt8 * begin = data.data();
         const UInt8 * pos = begin;
@@ -176,13 +205,23 @@ struct PositionImpl
                 res[i] = 0;
                 ++i;
             }
+            auto start = start_pos != nullptr ? start_pos->getUInt(i) : 0;
 
             /// We check that the entry does not pass through the boundaries of strings.
-            if (pos + needle.size() < begin + offsets[i])
-                res[i] = 1 + Impl::countChars(reinterpret_cast<const char *>(begin + offsets[i - 1]), reinterpret_cast<const char *>(pos));
-            else
+            if (pos + needle.size() < begin + offsets[i]) {
+                auto res_pos = 1 + Impl::countChars(reinterpret_cast<const char *>(begin + offsets[i - 1]), reinterpret_cast<const char *>(pos));
+                if (res_pos < start) {
+                    pos = reinterpret_cast<const UInt8 *>(Impl::advancePos(
+                        reinterpret_cast<const char *>(pos),
+                        reinterpret_cast<const char *>(begin + offsets[i]),
+                        start - res_pos));
+                    continue;
+                }
+                res[i] = res_pos;
+            }
+            else {
                 res[i] = 0;
-
+            }
             pos = begin + offsets[i];
             ++i;
         }
@@ -192,24 +231,64 @@ struct PositionImpl
     }
 
     /// Search for substring in string.
-    static void constantConstant(std::string data, std::string needle, UInt64 & res)
+    static void constantConstantScalar(
+        std::string data,
+        std::string needle,
+        UInt64 start_pos,
+        UInt64 & res)
     {
-        Impl::toLowerIfNeed(data);
-        Impl::toLowerIfNeed(needle);
+        auto start = std::max(start_pos, 1ul);
 
-        res = data.find(needle);
+        if (needle.size() == 0) {
+            size_t haystack_size = Impl::countChars(data.data(), data.data() + data.size());
+            res = start <= haystack_size + 1 ? start : 0;
+            return;
+        }
+
+        size_t start_byte = Impl::advancePos(data.data(), data.data() + data.size(), start - 1) - data.data();
+        res = data.find(needle, start_byte);
         if (res == std::string::npos)
             res = 0;
         else
             res = 1 + Impl::countChars(data.data(), data.data() + res);
     }
 
+    /// Search for substring in string starting from different positions.
+    static void constantConstant(
+        std::string data,
+        std::string needle,
+        const ColumnPtr & start_pos,
+        PaddedPODArray<UInt64> & res)
+    {
+        Impl::toLowerIfNeed(data);
+        Impl::toLowerIfNeed(needle);
+
+        if (start_pos == nullptr) {
+            constantConstantScalar(data, needle, 0, res[0]);
+            return;
+        }
+
+        size_t haystack_size = Impl::countChars(data.data(), data.data() + data.size());
+
+        size_t size = start_pos != nullptr ? start_pos->size() : 0;
+        for (size_t i = 0; i < size; ++i) {
+            auto start = start_pos->getUInt(i);
+
+            if (start > haystack_size + 1) {
+                res[i] = 0;
+                continue;
+            }
+            constantConstantScalar(data, needle, start, res[i]);
+        }
+    }
+
     /// Search each time for a different single substring inside each time different string.
     static void vectorVector(
         const ColumnString::Chars & haystack_data,
         const ColumnString::Offsets & haystack_offsets,
         const ColumnString::Chars & needle_data,
         const ColumnString::Offsets & needle_offsets,
+        const ColumnPtr & start_pos,
         PaddedPODArray<UInt64> & res)
     {
         ColumnString::Offset prev_haystack_offset = 0;
@@ -222,10 +301,15 @@ struct PositionImpl
             size_t needle_size = needle_offsets[i] - prev_needle_offset - 1;
             size_t haystack_size = haystack_offsets[i] - prev_haystack_offset - 1;
 
-            if (0 == needle_size)
+            auto start = start_pos != nullptr ? std::max(start_pos->getUInt(i), 1ul) : 1ul;
+
+            if (start > haystack_size + 1) {
+                res[i] = 0;
+            }
+            else if (0 == needle_size)
             {
-                /// An empty string is always at the very beginning of `haystack`.
-                res[i] = 1;
+                /// An empty string is always at any position in `haystack`.
+                res[i] = start;
             }
             else
             {
@@ -234,8 +318,12 @@ struct PositionImpl
                     reinterpret_cast<const char *>(&needle_data[prev_needle_offset]),
                     needle_offsets[i] - prev_needle_offset - 1); /// zero byte at the end
 
+                const char * beg = Impl::advancePos(
+                    reinterpret_cast<const char *>(&haystack_data[prev_haystack_offset]),
+                    reinterpret_cast<const char *>(&haystack_data[haystack_offsets[i] - 1]),
+                    start - 1);
                 /// searcher returns a pointer to the found substring or to the end of `haystack`.
-                size_t pos = searcher.search(&haystack_data[prev_haystack_offset], &haystack_data[haystack_offsets[i] - 1])
+                size_t pos = searcher.search(reinterpret_cast<const UInt8 *>(beg), &haystack_data[haystack_offsets[i] - 1])
                     - &haystack_data[prev_haystack_offset];
 
                 if (pos != haystack_size)
@@ -259,6 +347,7 @@ struct PositionImpl
         const String & haystack,
         const ColumnString::Chars & needle_data,
         const ColumnString::Offsets & needle_offsets,
+        const ColumnPtr & start_pos,
         PaddedPODArray<UInt64> & res)
     {
         // NOTE You could use haystack indexing. But this is a rare case.
@@ -271,17 +360,23 @@ struct PositionImpl
         {
             size_t needle_size = needle_offsets[i] - prev_needle_offset - 1;
 
-            if (0 == needle_size)
+            auto start = start_pos != nullptr ? std::max(start_pos->getUInt(i), 1ul) : 1ul;
+
+            if (start > haystack.size() + 1) {
+                res[i] = 0;
+            }
+            else if (0 == needle_size)
             {
-                res[i] = 1;
+                res[i] = start;
             }
             else
             {
                 typename Impl::SearcherInSmallHaystack searcher = Impl::createSearcherInSmallHaystack(
                     reinterpret_cast<const char *>(&needle_data[prev_needle_offset]), needle_offsets[i] - prev_needle_offset - 1);
 
+                const char * beg = Impl::advancePos(haystack.data(), haystack.data() + haystack.size(), start - 1);
                 size_t pos = searcher.search(
-                                 reinterpret_cast<const UInt8 *>(haystack.data()),
+                                reinterpret_cast<const UInt8 *>(beg),
                                  reinterpret_cast<const UInt8 *>(haystack.data()) + haystack.size())
                     - reinterpret_cast<const UInt8 *>(haystack.data());
 

tests/queries/0_stateless/00233_position_function_family.reference

@@ -23441,3 +23441,316 @@
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tests/queries/0_stateless/00233_position_function_family.sql

@@ -6,6 +6,23 @@ select 1 = position('abc', 'abc');
 select 2 = position('abc', 'bc');
 select 3 = position('abc', 'c');
 
+select 1 = position('', '', 0);
+select 1 = position('', '', 1);
+select 0 = position('', '', 2);
+select 1 = position('a', '', 1);
+select 2 = position('a', '', 2);
+select 0 = position('a', '', 3);
+
+select [1, 1, 2, 3, 4, 5, 0, 0, 0, 0] = groupArray(position('aaaa', '', number)) from numbers(10);
+select [1, 1, 2, 3, 4, 5, 0, 0, 0, 0] = groupArray(position(materialize('aaaa'), '', number)) from numbers(10);
+select [1, 1, 2, 3, 4, 5, 0, 0, 0, 0] = groupArray(position('aaaa', materialize(''), number)) from numbers(10);
+select [1, 1, 2, 3, 4, 5, 0, 0, 0, 0] = groupArray(position(materialize('aaaa'), materialize(''), number)) from numbers(10);
+
+select [1, 1, 2, 3, 4, 0, 0, 0, 0, 0] = groupArray(position('aaaa', 'a', number)) from numbers(10);
+select [1, 1, 2, 3, 4, 0, 0, 0, 0, 0] = groupArray(position(materialize('aaaa'), 'a', number)) from numbers(10);
+select [1, 1, 2, 3, 4, 0, 0, 0, 0, 0] = groupArray(position('aaaa', materialize('a'), number)) from numbers(10);
+select [1, 1, 2, 3, 4, 0, 0, 0, 0, 0] = groupArray(position(materialize('aaaa'), materialize('a'), number)) from numbers(10);
+
 select 1 = position(materialize(''), '');
 select 1 = position(materialize('abc'), '');
 select 0 = position(materialize(''), 'abc');
@@ -27,6 +44,16 @@ select 1 = position('абв', 'абв');
 select 3 = position('абв', 'бв');
 select 5 = position('абв', 'в');
 
+select 2 = position('abcabc', 'b', 0);
+select 2 = position('abcabc', 'b', 1);
+select 2 = position('abcabc', 'b', 2);
+select 5 = position('abcabc', 'b', 3);
+select 5 = position('abcabc', 'b', 4);
+select 5 = position('abcabc', 'b', 5);
+select 0 = position('abcabc', 'b', 6);
+select 2 = position('abcabc', 'bca', 0);
+select 0 = position('abcabc', 'bca', 3);
+
 select 1 = position(materialize(''), '');
 select 1 = position(materialize('абв'), '');
 select 0 = position(materialize(''), 'абв');
@@ -48,6 +75,14 @@ select 1 = positionUTF8('абв', 'абв');
 select 2 = positionUTF8('абв', 'бв');
 select 3 = positionUTF8('абв', 'в');
 
+select 3 = position('абвабв', 'б', 2);
+select 3 = position('абвабв', 'б', 3);
+select 3 = position('абвабв', 'бва', 2);
+select 9 = position('абвабв', 'б', 4);
+select 0 = position('абвабв', 'бва', 4);
+select 5 = position('абвабв', 'в', 0);
+select 11 = position('абвабв', 'в', 6);
+
 select 1 = positionUTF8(materialize(''), '');
 select 1 = positionUTF8(materialize('абв'), '');
 select 0 = positionUTF8(materialize(''), 'абв');
@@ -62,6 +97,51 @@ select 1 = positionUTF8(materialize('абв'), 'абв') from system.numbers lim
 select 2 = positionUTF8(materialize('абв'), 'бв') from system.numbers limit 10;
 select 3 = positionUTF8(materialize('абв'), 'в') from system.numbers limit 10;
 
+select 2 = positionUTF8('абвабв', 'б', 0);
+select 2 = positionUTF8('абвабв', 'б', 1);
+select 2 = positionUTF8('абвабв', 'б', 2);
+select 5 = positionUTF8('абвабв', 'б', 3);
+select 5 = positionUTF8('абвабв', 'б', 4);
+select 5 = positionUTF8('абвабв', 'б', 5);
+select 0 = positionUTF8('абвабв', 'б', 6);
+select 2 = positionUTF8('абвабв', 'бва', 0);
+select 0 = positionUTF8('абвабв', 'бва', 3);
+
+select 2 = positionUTF8(materialize('абвабв'), 'б', 0) from system.numbers limit 10;
+select 2 = positionUTF8(materialize('абвабв'), 'б', 1) from system.numbers limit 10;
+select 2 = positionUTF8(materialize('абвабв'), 'б', 2) from system.numbers limit 10;
+select 5 = positionUTF8(materialize('абвабв'), 'б', 3) from system.numbers limit 10;
+select 5 = positionUTF8(materialize('абвабв'), 'б', 4) from system.numbers limit 10;
+select 5 = positionUTF8(materialize('абвабв'), 'б', 5) from system.numbers limit 10;
+select 0 = positionUTF8(materialize('абвабв'), 'б', 6) from system.numbers limit 10;
+select 2 = positionUTF8(materialize('абвабв'), 'бва', 0) from system.numbers limit 10;
+select 0 = positionUTF8(materialize('абвабв'), 'бва', 3) from system.numbers limit 10;
+
+select 2 = positionUTF8('абвабв', materialize('б'), 0) from system.numbers limit 10;
+select 2 = positionUTF8('абвабв', materialize('б'), 1) from system.numbers limit 10;
+select 2 = positionUTF8('абвабв', materialize('б'), 2) from system.numbers limit 10;
+select 5 = positionUTF8('абвабв', materialize('б'), 3) from system.numbers limit 10;
+select 5 = positionUTF8('абвабв', materialize('б'), 4) from system.numbers limit 10;
+select 5 = positionUTF8('абвабв', materialize('б'), 5) from system.numbers limit 10;
+select 0 = positionUTF8('абвабв', materialize('б'), 6) from system.numbers limit 10;
+select 2 = positionUTF8('абвабв', materialize('бва'), 0) from system.numbers limit 10;
+select 0 = positionUTF8('абвабв', materialize('бва'), 3) from system.numbers limit 10;
+
+select 2 = positionUTF8(materialize('абвабв'), materialize('б'), 0) from system.numbers limit 10;
+select 2 = positionUTF8(materialize('абвабв'), materialize('б'), 1) from system.numbers limit 10;
+select 2 = positionUTF8(materialize('абвабв'), materialize('б'), 2) from system.numbers limit 10;
+select 5 = positionUTF8(materialize('абвабв'), materialize('б'), 3) from system.numbers limit 10;
+select 5 = positionUTF8(materialize('абвабв'), materialize('б'), 4) from system.numbers limit 10;
+select 5 = positionUTF8(materialize('абвабв'), materialize('б'), 5) from system.numbers limit 10;
+select 0 = positionUTF8(materialize('абвабв'), materialize('б'), 6) from system.numbers limit 10;
+select 2 = positionUTF8(materialize('абвабв'), materialize('бва'), 0) from system.numbers limit 10;
+select 0 = positionUTF8(materialize('абвабв'), materialize('бва'), 3) from system.numbers limit 10;
+
+select [2, 2, 2, 5, 5, 5, 0, 0, 0, 0] = groupArray(positionUTF8(materialize('абвабв'), materialize('б'), number)) from numbers(10);
+select [2, 2, 2, 5, 5, 5, 0, 0, 0, 0] = groupArray(positionUTF8('абвабв', materialize('б'), number)) from numbers(10);
+select [2, 2, 2, 5, 5, 5, 0, 0, 0, 0] = groupArray(positionUTF8('абвабв', 'б', number)) from numbers(10);
+select [2, 2, 2, 5, 5, 5, 0, 0, 0, 0] = groupArray(positionUTF8(materialize('абвабв'), 'б', number)) from numbers(10);
+
 select 1 = positionCaseInsensitive('', '');
 select 1 = positionCaseInsensitive('abc', '');
 select 0 = positionCaseInsensitive('', 'aBc');