support implicit conversions between index in operator [] and key of Map

src/Functions/array/arrayElement.cpp

@@ -1,6 +1,7 @@
 #include <Functions/IFunction.h>
 #include <Functions/FunctionFactory.h>
 #include <Functions/FunctionHelpers.h>
+#include <Functions/castTypeToEither.h>
 #include <DataTypes/DataTypeArray.h>
 #include <DataTypes/DataTypeNullable.h>
 #include <DataTypes/DataTypeTuple.h>
@@ -95,32 +96,30 @@ private:
 
     using Offsets = ColumnArray::Offsets;
 
-    static bool matchKeyToIndex(const IColumn & data, const Offsets & offsets,
+    static bool matchKeyToIndexNumber(
-        const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs);
+        const IColumn & data, const Offsets & offsets, bool is_key_const,
+        const IColumn & index, PaddedPODArray<UInt64> & matched_idxs);
 
-    static bool matchKeyToIndexConst(const IColumn & data, const Offsets & offsets,
+    static bool matchKeyToIndexNumberConst(
+        const IColumn & data, const Offsets & offsets,
         const Field & index, PaddedPODArray<UInt64> & matched_idxs);
 
-    template <typename DataType>
+    static bool matchKeyToIndexString(
-    static bool matchKeyToIndexNumber(const IColumn & data, const Offsets & offsets,
+        const IColumn & data, const Offsets & offsets, bool is_key_const,
-        const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs);
+        const IColumn & index, PaddedPODArray<UInt64> & matched_idxs);
 
-    template <typename DataType>
+    static bool matchKeyToIndexStringConst(
-    static bool matchKeyToIndexNumberConst(const IColumn & data, const Offsets & offsets,
+        const IColumn & data, const Offsets & offsets,
-        const Field & index, PaddedPODArray<UInt64> & matched_idxs);
-
-    static bool matchKeyToIndexString(const IColumn & data, const Offsets & offsets,
-        const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs);
-
-    static bool matchKeyToIndexFixedString(const IColumn & data, const Offsets & offsets,
-        const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs);
-
-    static bool matchKeyToIndexStringConst(const IColumn & data, const Offsets & offsets,
         const Field & index, PaddedPODArray<UInt64> & matched_idxs);
 
     template <typename Matcher>
     static void executeMatchKeyToIndex(const Offsets & offsets,
         PaddedPODArray<UInt64> & matched_idxs, const Matcher & matcher);
+
+    template <typename Matcher>
+    static void executeMatchConstKeyToIndex(
+        size_t num_rows, size_t num_values,
+        PaddedPODArray<UInt64> & matched_idxs, const Matcher & matcher);
 };
 
 
@@ -759,23 +758,11 @@ ColumnPtr FunctionArrayElement::executeTuple(const ColumnsWithTypeAndName & argu
 namespace
 {
 
+template<typename DataColumn, typename IndexColumn>
 struct MatcherString
 {
-    const ColumnString & data;
+    const DataColumn & data;
-    const ColumnString & index;
+    const IndexColumn & index;
-
-    bool match(size_t row_data, size_t row_index) const
-    {
-        auto data_ref = data.getDataAt(row_data);
-        auto index_ref = index.getDataAt(row_index);
-        return memequalSmallAllowOverflow15(index_ref.data, index_ref.size, data_ref.data, data_ref.size);
-    }
-};
-
-struct MatcherFixedString
-{
-    const ColumnFixedString & data;
-    const ColumnFixedString & index;
 
     bool match(size_t row_data, size_t row_index) const
     {
@@ -785,9 +772,10 @@ struct MatcherFixedString
     }
 };
 
+template<typename DataColumn>
 struct MatcherStringConst
 {
-    const ColumnString & data;
+    const DataColumn & data;
     const String & index;
 
     bool match(size_t row_data, size_t /* row_index */) const
@@ -797,23 +785,23 @@ struct MatcherStringConst
     }
 };
 
-template <typename T>
+template <typename DataType, typename IndexType>
 struct MatcherNumber
 {
-    const PaddedPODArray<T> & data;
+    const PaddedPODArray<DataType> & data;
-    const PaddedPODArray<T> & index;
+    const PaddedPODArray<IndexType> & index;
 
     bool match(size_t row_data, size_t row_index) const
     {
-        return data[row_data] == index[row_index];
+        return data[row_data] == static_cast<DataType>(index[row_index]);
     }
 };
 
-template <typename T>
+template <typename DataType>
 struct MatcherNumberConst
 {
-    const PaddedPODArray<T> & data;
+    const PaddedPODArray<DataType> & data;
-    T index;
+    DataType index;
 
     bool match(size_t row_data, size_t /* row_index */) const
     {
@@ -848,147 +836,158 @@ void FunctionArrayElement::executeMatchKeyToIndex(
     }
 }
 
+template <typename Matcher>
+void FunctionArrayElement::executeMatchConstKeyToIndex(
+    size_t num_rows, size_t num_values,
+    PaddedPODArray<UInt64> & matched_idxs, const Matcher & matcher)
+{
+    for (size_t i = 0; i < num_rows; ++i)
+    {
+        bool matched = false;
+        for (size_t j = 0; j < num_values; ++j)
+        {
+            if (matcher.match(j, i))
+            {
+                matched_idxs.push_back(j + 1);
+                matched = true;
+                break;
+            }
+        }
+
+        if (!matched)
+            matched_idxs.push_back(0);
+    }
+}
+
+template <typename F>
+static bool castColumnString(const IColumn * column, F && f)
+{
+    return castTypeToEither<ColumnString, ColumnFixedString>(column, std::forward<F>(f));
+}
+
 bool FunctionArrayElement::matchKeyToIndexStringConst(
     const IColumn & data, const Offsets & offsets,
     const Field & index, PaddedPODArray<UInt64> & matched_idxs)
 {
-    const auto * data_string = checkAndGetColumn<ColumnString>(&data);
+    return castColumnString(&data, [&](const auto & data_column)
-    if (!data_string)
+    {
-        return false;
+        using DataColumn = std::decay_t<decltype(data_column)>;
 
-    if (index.getType() != Field::Types::String)
+        MatcherStringConst<DataColumn> matcher{data_column, get<const String &>(index)};
-        return false;
-
-    MatcherStringConst matcher{*data_string, get<const String &>(index)};
         executeMatchKeyToIndex(offsets, matched_idxs, matcher);
         return true;
+    });
 }
 
 bool FunctionArrayElement::matchKeyToIndexString(
-    const IColumn & data, const Offsets & offsets,
+    const IColumn & data, const Offsets & offsets, bool is_key_const,
-    const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs)
+    const IColumn & index, PaddedPODArray<UInt64> & matched_idxs)
 {
-    const auto * index_string = checkAndGetColumn<ColumnString>(arguments[1].column.get());
+    return castColumnString(&data, [&](const auto & data_column)
-    if (!index_string)
+    {
-        return false;
+        return castColumnString(&index, [&](const auto & index_column)
+        {
+            using DataColumn = std::decay_t<decltype(data_column)>;
+            using IndexColumn = std::decay_t<decltype(index_column)>;
 
-    const auto * data_string = checkAndGetColumn<ColumnString>(&data);
+            MatcherString<DataColumn, IndexColumn> matcher{data_column, index_column};
-    if (!data_string)
+            if (is_key_const)
-        return false;
+                executeMatchConstKeyToIndex(index.size(), data.size(), matched_idxs, matcher);
-
+            else
-    MatcherString matcher{*data_string, *index_string};
                 executeMatchKeyToIndex(offsets, matched_idxs, matcher);
+
             return true;
+        });
+    });
 }
 
-bool FunctionArrayElement::matchKeyToIndexFixedString(
+template <typename FromType, typename ToType>
-    const IColumn & data, const Offsets & offsets,
+static constexpr bool areConvertibleTypes =
-    const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs)
+    std::is_same_v<FromType, ToType>
+        || (is_integer_v<FromType> && is_integer_v<ToType>
+            && std::is_convertible_v<FromType, ToType>);
+
+template <typename F>
+static bool castColumnNumeric(const IColumn * column, F && f)
 {
-    const auto * index_string = checkAndGetColumn<ColumnFixedString>(arguments[1].column.get());
+    return castTypeToEither<
-    if (!index_string)
+        ColumnVector<UInt8>,
-        return false;
+        ColumnVector<UInt16>,
-
+        ColumnVector<UInt32>,
-    const auto * data_string = checkAndGetColumn<ColumnFixedString>(&data);
+        ColumnVector<UInt64>,
-    if (!data_string)
+        ColumnVector<UInt128>,
-        return false;
+        ColumnVector<UInt256>,
-
+        ColumnVector<Int8>,
-    MatcherFixedString matcher{*data_string, *index_string};
+        ColumnVector<Int16>,
-    executeMatchKeyToIndex(offsets, matched_idxs, matcher);
+        ColumnVector<Int32>,
-    return true;
+        ColumnVector<Int64>,
+        ColumnVector<Int128>,
+        ColumnVector<Int256>,
+        ColumnVector<UUID>
+    >(column, std::forward<F>(f));
 }
 
-template <typename DataType>
 bool FunctionArrayElement::matchKeyToIndexNumberConst(
     const IColumn & data, const Offsets & offsets,
     const Field & index, PaddedPODArray<UInt64> & matched_idxs)
 {
-    const auto * data_numeric = checkAndGetColumn<ColumnVector<DataType>>(&data);
+    return castColumnNumeric(&data, [&](const auto & data_column)
-    if (!data_numeric)
+    {
-        return false;
+        using DataType = typename std::decay_t<decltype(data_column)>::ValueType;
-
         std::optional<DataType> index_as_integer;
+
         Field::dispatch([&](const auto & value)
         {
             using FieldType = std::decay_t<decltype(value)>;
-        if constexpr (std::is_same_v<FieldType, DataType> || (is_integer_v<FieldType> && std::is_convertible_v<FieldType, DataType>))
+            if constexpr (areConvertibleTypes<FieldType, DataType>)
                 index_as_integer = static_cast<DataType>(value);
         }, index);
 
         if (!index_as_integer)
             return false;
 
-    MatcherNumberConst<DataType> matcher{data_numeric->getData(), *index_as_integer};
+        MatcherNumberConst<DataType> matcher{data_column.getData(), *index_as_integer};
         executeMatchKeyToIndex(offsets, matched_idxs, matcher);
         return true;
+    });
 }
 
-template <typename DataType>
 bool FunctionArrayElement::matchKeyToIndexNumber(
-    const IColumn & data, const Offsets & offsets,
+    const IColumn & data, const Offsets & offsets, bool is_key_const,
-    const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs)
+    const IColumn & index, PaddedPODArray<UInt64> & matched_idxs)
 {
-    const auto * index_numeric = checkAndGetColumn<ColumnVector<DataType>>(arguments[1].column.get());
+    return castColumnNumeric(&data, [&](const auto & data_column)
-    if (!index_numeric)
+    {
-        return false;
+        return castColumnNumeric(&index, [&](const auto & index_column)
+        {
+            using DataType = typename std::decay_t<decltype(data_column)>::ValueType;
+            using IndexType = typename std::decay_t<decltype(index_column)>::ValueType;
 
-    const auto * data_numeric = checkAndGetColumn<ColumnVector<DataType>>(&data);
+            if constexpr (areConvertibleTypes<IndexType, DataType>)
-    if (!data_numeric)
+            {
-        return false;
+                MatcherNumber<DataType, IndexType> matcher{data_column.getData(), index_column.getData()};
-
+                if (is_key_const)
-    MatcherNumber<DataType> matcher{data_numeric->getData(), index_numeric->getData()};
+                    executeMatchConstKeyToIndex(index_column.size(), data_column.size(), matched_idxs, matcher);
+                else
                     executeMatchKeyToIndex(offsets, matched_idxs, matcher);
+
                 return true;
-}
+            }
 
-bool FunctionArrayElement::matchKeyToIndex(
+            return false;
-    const IColumn & data, const Offsets & offsets,
+        });
-    const ColumnsWithTypeAndName & arguments, PaddedPODArray<UInt64> & matched_idxs)
+    });
-{
-    return matchKeyToIndexNumber<UInt8>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<UInt16>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<UInt32>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<UInt64>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<UInt128>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<UInt256>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<Int8>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<Int16>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<Int32>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<Int64>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<Int128>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<Int256>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<UInt256>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexNumber<UUID>(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexString(data, offsets, arguments, matched_idxs)
-        || matchKeyToIndexFixedString(data, offsets, arguments, matched_idxs);
-}
-
-bool FunctionArrayElement::matchKeyToIndexConst(
-    const IColumn & data, const Offsets & offsets,
-    const Field & index, PaddedPODArray<UInt64> & matched_idxs)
-{
-    return matchKeyToIndexNumberConst<UInt8>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<UInt16>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<UInt32>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<UInt64>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<UInt128>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<UInt256>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<Int8>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<Int16>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<Int32>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<Int64>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<Int128>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<Int256>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexNumberConst<UUID>(data, offsets, index, matched_idxs)
-        || matchKeyToIndexStringConst(data, offsets, index, matched_idxs);
 }
 
 ColumnPtr FunctionArrayElement::executeMap(
     const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const
 {
-    const ColumnMap * col_map = typeid_cast<const ColumnMap *>(arguments[0].column.get());
+    const auto * col_map = checkAndGetColumn<ColumnMap>(arguments[0].column.get());
-    if (!col_map)
+    const auto * col_const_map = checkAndGetColumnConst<ColumnMap>(arguments[0].column.get());
-        return nullptr;
+    assert(col_map || col_const_map);
+
+    if (col_const_map)
+        col_map = typeid_cast<const ColumnMap *>(&col_const_map->getDataColumn());
 
     const auto & nested_column = col_map->getNestedColumn();
     const auto & keys_data = col_map->getNestedData().getColumn(0);
@@ -1000,29 +999,33 @@ ColumnPtr FunctionArrayElement::executeMap(
     indices_column->reserve(input_rows_count);
     auto & indices_data = assert_cast<ColumnVector<UInt64> &>(*indices_column).getData();
 
+    bool executed = false;
     if (!isColumnConst(*arguments[1].column))
     {
-        if (input_rows_count > 0 && !matchKeyToIndex(keys_data, offsets, arguments, indices_data))
+        executed = matchKeyToIndexNumber(keys_data, offsets, !!col_const_map, *arguments[1].column, indices_data)
-            throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
+            || matchKeyToIndexString(keys_data, offsets, !!col_const_map, *arguments[1].column, indices_data);
-                "Illegal types of arguments: {}, {} for function {}",
-                arguments[0].type->getName(), arguments[1].type->getName(), getName());
     }
     else
     {
         Field index = (*arguments[1].column)[0];
+        executed = matchKeyToIndexNumberConst(keys_data, offsets, index, indices_data)
+            || matchKeyToIndexStringConst(keys_data, offsets, index, indices_data);
+    }
 
-        // Get Matched key's value
+    if (!executed)
-        if (input_rows_count > 0 && !matchKeyToIndexConst(keys_data, offsets, index, indices_data))
         throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
             "Illegal types of arguments: {}, {} for function {}",
             arguments[0].type->getName(), arguments[1].type->getName(), getName());
-    }
+
+    ColumnPtr values_array = ColumnArray::create(values_data.getPtr(), nested_column.getOffsetsPtr());
+    if (col_const_map)
+        values_array = ColumnConst::create(values_array, input_rows_count);
 
     /// Prepare arguments to call arrayElement for array with values and calculated indices at previous step.
     ColumnsWithTypeAndName new_arguments =
     {
         {
-            ColumnArray::create(values_data.getPtr(), nested_column.getOffsetsPtr()),
+            values_array,
             std::make_shared<DataTypeArray>(result_type),
             ""
         },
@@ -1066,13 +1069,14 @@ DataTypePtr FunctionArrayElement::getReturnTypeImpl(const DataTypes & arguments)
 
 ColumnPtr FunctionArrayElement::executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const
 {
-    /// Check nullability.
+    const auto * col_map = checkAndGetColumn<ColumnMap>(arguments[0].column.get());
-    bool is_array_of_nullable = false;
+    const auto * col_const_map = checkAndGetColumnConst<ColumnMap>(arguments[0].column.get());
 
-    const ColumnMap * col_map = checkAndGetColumn<ColumnMap>(arguments[0].column.get());
+    if (col_map || col_const_map)
-    if (col_map)
         return executeMap(arguments, result_type, input_rows_count);
 
+    /// Check nullability.
+    bool is_array_of_nullable = false;
     const ColumnArray * col_array = nullptr;
     const ColumnArray * col_const_array = nullptr;
 

tests/queries/0_stateless/02014_map_different_keys.reference

@@ -0,0 +1,22 @@
+...const maps...
+0
+2
+0
+4
+0
+0
+2
+0
+4
+0
+4
+4
+...int keys...
+foo	bar	bar
+	foo	foo
+...string keys...
+foo	foo
+foo	foo
+foo	foo
+bar	bar
+0

tests/queries/0_stateless/02014_map_different_keys.sql

@@ -0,0 +1,32 @@
+SELECT '...const maps...';
+
+WITH map(1, 2, 3, 4) AS m SELECT m[number] FROM numbers(5);
+WITH map('1', 2, '3', 4) AS m SELECT m[toString(number)] FROM numbers(5);
+
+WITH map(1, 2, 3, 4) AS m SELECT m[3];
+WITH map('1', 2, '3', 4) AS m SELECT m['3'];
+
+DROP TABLE IF EXISTS t_map_02014;
+
+CREATE TABLE t_map_02014(i1 UInt64, i2 Int32, m1 Map(UInt32, String), m2 Map(Int8, String), m3 Map(Int128, String)) ENGINE = Memory;
+INSERT INTO t_map_02014 VALUES (1, -1, map(1, 'foo', 2, 'bar'), map(-1, 'foo', 1, 'bar'), map(-1, 'foo', 1, 'bar'));
+
+SELECT '...int keys...';
+
+SELECT m1[i1], m2[i1], m3[i1] FROM t_map_02014;
+SELECT m1[i2], m2[i2], m3[i2] FROM t_map_02014;
+
+DROP TABLE IF EXISTS t_map_02014;
+
+CREATE TABLE t_map_02014(s String, fs FixedString(3), m1 Map(String, String), m2 Map(FixedString(3), String)) ENGINE = Memory;
+INSERT INTO t_map_02014 VALUES ('aaa', 'bbb', map('aaa', 'foo', 'bbb', 'bar'), map('aaa', 'foo', 'bbb', 'bar'));
+
+SELECT '...string keys...';
+
+SELECT m1['aaa'], m2['aaa'] FROM t_map_02014;
+SELECT m1['aaa'::FixedString(3)], m2['aaa'::FixedString(3)] FROM t_map_02014;
+SELECT m1[s], m2[s] FROM t_map_02014;
+SELECT m1[fs], m2[fs] FROM t_map_02014;
+SELECT length(m2['aaa'::FixedString(4)]) FROM t_map_02014;
+
+DROP TABLE IF EXISTS t_map_02014;