try to avoid field operations by providing new method in IColumn

src/Analyzer/ConstantNode.cpp

@@ -102,10 +102,35 @@ bool ConstantNode::requiresCastCall(Field::Types::Which type, const DataTypePtr
     return need_to_add_cast_function;
 }
 
-bool ConstantNode::requiresCastCall() const
+bool ConstantNode::requiresCastCall(const DataTypePtr & field_type, const DataTypePtr & data_type)
 {
-    const auto & [name, type, field_type] = getFieldAttributes();
+    bool need_to_add_cast_function = false;
-    return requiresCastCall(type, field_type, getResultType());
+    WhichDataType constant_value_literal_type(field_type);
+    WhichDataType constant_value_type(data_type);
+
+    switch (constant_value_literal_type.idx)
+    {
+        case TypeIndex::String:
+        {
+            need_to_add_cast_function = !constant_value_type.isString();
+            break;
+        }
+        case TypeIndex::UInt64:
+        case TypeIndex::Int64:
+        case TypeIndex::Float64:
+        {
+            WhichDataType constant_value_field_type(field_type);
+            need_to_add_cast_function = constant_value_field_type.idx != constant_value_type.idx;
+            break;
+        }
+        default:
+        {
+            need_to_add_cast_function = true;
+            break;
+        }
+    }
+
+    return need_to_add_cast_function;
 }
 
 bool ConstantNode::receivedFromInitiatorServer() const

src/Analyzer/ConstantNode.h

@@ -92,10 +92,9 @@ public:
         return constant_value.getType();
     }
 
-    static bool requiresCastCall(Field::Types::Which type, const DataTypePtr & field_type, const DataTypePtr & data_type);
-
     /// Check if conversion to AST requires wrapping with _CAST function.
-    bool requiresCastCall() const;
+    static bool requiresCastCall(Field::Types::Which type, const DataTypePtr & field_type, const DataTypePtr & data_type);
+    static bool requiresCastCall(const DataTypePtr & field_type, const DataTypePtr & data_type);
 
     /// Check if constant is a result of _CAST function constant folding.
     bool receivedFromInitiatorServer() const;
@@ -109,10 +108,9 @@ public:
 
     void dumpTreeImpl(WriteBuffer & buffer, FormatState & format_state, size_t indent) const override;
 
-    std::tuple<String, Field::Types::Which, DataTypePtr> getFieldAttributes() const
+    std::pair<String, DataTypePtr> getValueNameAndType() const
     {
-        const auto & [name, type, field_type] = constant_value.getFieldAttributes();
+        return constant_value.getValueNameAndType();
-        return {name + "_" + constant_value.getType()->getName(), type, field_type};
     }
 
 protected:

src/Analyzer/ConstantValue.h

@@ -21,7 +21,6 @@ public:
     ConstantValue(const Field & field_, DataTypePtr data_type_)
         : column(data_type_->createColumnConst(1, field_))
         , data_type(std::move(data_type_))
-        , field_cache(applyVisitor(FieldVisitorToString(), field_), field_.getType(), applyVisitor(FieldToDataType<LeastSupertypeOnError::Variant>(), field_))
     {}
 
     const ColumnPtr & getColumn() const
@@ -34,21 +33,9 @@ public:
         return data_type;
     }
 
-    const std::tuple<String, Field::Types::Which, DataTypePtr> & getFieldAttributes() const &
+    std::pair<String, DataTypePtr> getValueNameAndType() const
     {
-        if (std::get<String>(field_cache).empty())
+        return column->getValueNameAndType(0);
-        {
-            Field field;
-            column->get(0, field);
-             field_cache = {applyVisitor(FieldVisitorToString(), field), field.getType(), applyVisitor(FieldToDataType<LeastSupertypeOnError::Variant>(), field)};
-        }
-
-        return field_cache;
-    }
-
-    std::tuple<String, Field::Types::Which, DataTypePtr> getFieldAttributes() const &&
-    {
-        return getFieldAttributes();
     }
 
 private:
@@ -62,7 +49,6 @@ private:
 
     ColumnPtr column;
     DataTypePtr data_type;
-    mutable std::tuple<String, Field::Types::Which, DataTypePtr> field_cache;
 };
 
 }

src/Columns/ColumnAggregateFunction.cpp

@@ -1,4 +1,6 @@
+#include <IO/WriteHelpers.h>
 #include <Columns/ColumnAggregateFunction.h>
+#include <DataTypes/DataTypeFactory.h>
 
 #include <AggregateFunctions/IAggregateFunction.h>
 #include <Columns/ColumnsCommon.h>
@@ -470,6 +472,19 @@ void ColumnAggregateFunction::get(size_t n, Field & res) const
     res = operator[](n);
 }
 
+std::pair<String, DataTypePtr> ColumnAggregateFunction::getValueNameAndType(size_t n) const
+{
+    String state;
+    {
+        WriteBufferFromOwnString buffer;
+        func->serialize(data[n], buffer, version);
+        WriteBufferFromString wb(state);
+        writeQuoted(buffer.str(), wb);
+    }
+
+    return {state, DataTypeFactory::instance().get(type_string)};
+}
+
 StringRef ColumnAggregateFunction::getDataAt(size_t n) const
 {
     return StringRef(reinterpret_cast<const char *>(&data[n]), sizeof(data[n]));

src/Columns/ColumnAggregateFunction.h

@@ -136,6 +136,8 @@ public:
 
     void get(size_t n, Field & res) const override;
 
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
+
     bool isDefaultAt(size_t) const override
     {
         throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method isDefaultAt is not supported for ColumnAggregateFunction");

src/Columns/ColumnArray.cpp

@@ -1,3 +1,5 @@
+#include <DataTypes/getLeastSupertype.h>
+#include <DataTypes/DataTypeArray.h>
 #include <Columns/ColumnArray.h>
 #include <Columns/ColumnsNumber.h>
 #include <Columns/ColumnDecimal.h>
@@ -148,6 +150,27 @@ void ColumnArray::get(size_t n, Field & res) const
         res_arr.push_back(getData()[offset + i]);
 }
 
+std::pair<String, DataTypePtr> ColumnArray::getValueNameAndType(size_t n) const
+{
+    size_t offset = offsetAt(n);
+    size_t size = sizeAt(n);
+
+    String value_name {"["};
+    DataTypes element_types;
+    element_types.reserve(size);
+
+    for (size_t i = 0; i < size; ++i)
+    {
+        const auto & [value, type] = getData().getValueNameAndType(offset + i);
+        element_types.push_back(type);
+        if (i > 0)
+            value_name += ", ";
+        value_name += value;
+    }
+    value_name += "]";
+
+    return {value_name, std::make_shared<DataTypeArray>(getLeastSupertype<LeastSupertypeOnError::Variant>(element_types))};
+}
 
 StringRef ColumnArray::getDataAt(size_t n) const
 {

src/Columns/ColumnArray.h

@@ -74,6 +74,7 @@ public:
     size_t size() const override;
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
     StringRef getDataAt(size_t n) const override;
     bool isDefaultAt(size_t n) const override;
     void insertData(const char * pos, size_t length) override;

src/Columns/ColumnCompressed.h

@@ -82,6 +82,7 @@ public:
     TypeIndex getDataType() const override { throwMustBeDecompressed(); }
     Field operator[](size_t) const override { throwMustBeDecompressed(); }
     void get(size_t, Field &) const override { throwMustBeDecompressed(); }
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t) const override { throwMustBeDecompressed(); }
     StringRef getDataAt(size_t) const override { throwMustBeDecompressed(); }
     bool isDefaultAt(size_t) const override { throwMustBeDecompressed(); }
     void insert(const Field &) override { throwMustBeDecompressed(); }

src/Columns/ColumnConst.h

@@ -78,6 +78,11 @@ public:
         data->get(0, res);
     }
 
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t) const override
+    {
+        return data->getValueNameAndType(0);
+    }
+
     StringRef getDataAt(size_t) const override
     {
         return data->getDataAt(0);

src/Columns/ColumnDecimal.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <Common/FieldVisitorToString.h>
+#include <DataTypes/FieldToDataType.h>
 #include <base/sort.h>
 #include <base/TypeName.h>
 #include <Core/Field.h>
@@ -121,6 +123,10 @@ public:
 
     Field operator[](size_t n) const override { return DecimalField(data[n], scale); }
     void get(size_t n, Field & res) const override { res = (*this)[n]; }
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override
+    {
+        return {FieldVisitorToString()(data[n], scale), FieldToDataType()(data[n], scale)};
+    }
     bool getBool(size_t n) const override { return bool(data[n].value); }
     Int64 getInt(size_t n) const override { return Int64(data[n].value); }
     UInt64 get64(size_t n) const override;

src/Columns/ColumnDynamic.cpp

@@ -303,6 +303,22 @@ void ColumnDynamic::get(size_t n, Field & res) const
     type->getDefaultSerialization()->deserializeBinary(res, buf, getFormatSettings());
 }
 
+std::pair<String, DataTypePtr> ColumnDynamic::getValueNameAndType(size_t n) const
+{
+    const auto & variant_col = getVariantColumn();
+    /// Check if value is not in shared variant.
+    if (variant_col.globalDiscriminatorAt(n) != getSharedVariantDiscriminator())
+        return variant_col.getValueNameAndType(n);
+
+    /// We should deeserialize value from shared variant.
+    const auto & shared_variant = getSharedVariant();
+    auto value_data = shared_variant.getDataAt(variant_col.offsetAt(n));
+    ReadBufferFromMemory buf(value_data.data, value_data.size);
+    auto type = decodeDataType(buf);
+    const auto col = type->createColumn();
+    type->getDefaultSerialization()->deserializeBinary(*col, buf, getFormatSettings());
+    return col->getValueNameAndType(0);
+}
 
 #if !defined(DEBUG_OR_SANITIZER_BUILD)
 void ColumnDynamic::insertFrom(const IColumn & src_, size_t n)

src/Columns/ColumnDynamic.h

@@ -143,6 +143,8 @@ public:
 
     void get(size_t n, Field & res) const override;
 
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
+
     bool isDefaultAt(size_t n) const override
     {
         return variant_column_ptr->isDefaultAt(n);

src/Columns/ColumnFixedString.h

@@ -1,5 +1,8 @@
 #pragma once
 
+#include <DataTypes/DataTypeString.h>
+#include <IO/WriteHelpers.h>
+#include <IO/WriteBufferFromString.h>
 #include <Common/PODArray.h>
 #include <Common/memcmpSmall.h>
 #include <Common/typeid_cast.h>
@@ -87,6 +90,13 @@ public:
         res = std::string_view{reinterpret_cast<const char *>(&chars[n * index]), n};
     }
 
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t index) const override
+    {
+        WriteBufferFromOwnString buf;
+        writeQuoted(std::string_view{reinterpret_cast<const char *>(&chars[n * index]), n}, buf);
+        return {buf.str(), std::make_shared<DataTypeString>()};
+    }
+
     StringRef getDataAt(size_t index) const override
     {
         return StringRef(&chars[n * index], n);

src/Columns/ColumnFunction.cpp

@@ -1,3 +1,4 @@
+#include <DataTypes/DataTypeTuple.h>
 #include <Interpreters/ExpressionActions.h>
 #include <Columns/ColumnFunction.h>
 #include <Columns/ColumnsCommon.h>
@@ -91,6 +92,27 @@ void ColumnFunction::get(size_t n, Field & res) const
         res_tuple.push_back((*captured_columns[i].column)[n]);
 }
 
+std::pair<String, DataTypePtr> ColumnFunction::getValueNameAndType(size_t n) const
+{
+    size_t size = captured_columns.size();
+
+    String value_name {size > 1 ? "(" : "tuple("};
+    DataTypes element_types;
+    element_types.reserve(size);
+
+    for (size_t i = 0; i < size; ++i)
+    {
+        const auto & [value, type] = captured_columns[i].column->getValueNameAndType(n);
+        element_types.push_back(type);
+        if (i > 0)
+            value_name += ", ";
+        value_name += value;
+    }
+    value_name += ")";
+
+    return {value_name, std::make_shared<DataTypeTuple>(element_types)};
+}
+
 
 #if !defined(DEBUG_OR_SANITIZER_BUILD)
 void ColumnFunction::insertFrom(const IColumn & src, size_t n)

src/Columns/ColumnFunction.h

@@ -64,6 +64,8 @@ public:
 
     void get(size_t n, Field & res) const override;
 
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
+
     StringRef getDataAt(size_t) const override
     {
         throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Cannot get value from {}", getName());

src/Columns/ColumnLowCardinality.h

@@ -58,6 +58,10 @@ public:
 
     Field operator[](size_t n) const override { return getDictionary()[getIndexes().getUInt(n)]; }
     void get(size_t n, Field & res) const override { getDictionary().get(getIndexes().getUInt(n), res); }
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override
+    {
+        return getDictionary().getValueNameAndType(getIndexes().getUInt(n));
+    }
 
     StringRef getDataAt(size_t n) const override { return getDictionary().getDataAt(getIndexes().getUInt(n)); }
 

src/Columns/ColumnMap.cpp

@@ -1,3 +1,5 @@
+#include <DataTypes/getLeastSupertype.h>
+#include <DataTypes/DataTypeArray.h>
 #include <Columns/ColumnMap.h>
 #include <Columns/ColumnCompressed.h>
 #include <IO/WriteBufferFromString.h>
@@ -79,6 +81,29 @@ void ColumnMap::get(size_t n, Field & res) const
         map.push_back(getNestedData()[offset + i]);
 }
 
+std::pair<String, DataTypePtr> ColumnMap::getValueNameAndType(size_t n) const
+{
+    const auto & offsets = getNestedColumn().getOffsets();
+    size_t offset = offsets[n - 1];
+    size_t size = offsets[n] - offsets[n - 1];
+
+    String value_name {"["};
+    DataTypes element_types;
+    element_types.reserve(size);
+
+    for (size_t i = 0; i < size; ++i)
+    {
+        const auto & [value, type] = getNestedData().getValueNameAndType(offset + i);
+        element_types.push_back(type);
+        if (i > 0)
+            value_name += ", ";
+        value_name += value;
+    }
+    value_name += "]";
+
+    return {value_name, std::make_shared<DataTypeArray>(getLeastSupertype<LeastSupertypeOnError::Variant>(element_types))};
+}
+
 bool ColumnMap::isDefaultAt(size_t n) const
 {
     return nested->isDefaultAt(n);

src/Columns/ColumnMap.h

@@ -51,6 +51,7 @@ public:
 
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
 
     bool isDefaultAt(size_t n) const override;
     StringRef getDataAt(size_t n) const override;

src/Columns/ColumnNullable.cpp

@@ -1,3 +1,5 @@
+#include <DataTypes/DataTypeNothing.h>
+#include <DataTypes/DataTypeNullable.h>
 #include <Common/Arena.h>
 #include <Common/HashTable/StringHashSet.h>
 #include <Common/SipHash.h>
@@ -115,6 +117,14 @@ void ColumnNullable::get(size_t n, Field & res) const
         getNestedColumn().get(n, res);
 }
 
+std::pair<String, DataTypePtr> ColumnNullable::getValueNameAndType(size_t n) const
+{
+    if (isNullAt(n))
+        return {"NULL",  std::make_shared<DataTypeNullable>(std::make_shared<DataTypeNothing>())};
+
+    return getNestedColumn().getValueNameAndType(n);
+}
+
 Float64 ColumnNullable::getFloat64(size_t n) const
 {
     if (isNullAt(n))

src/Columns/ColumnNullable.h

@@ -55,6 +55,7 @@ public:
     bool isNullAt(size_t n) const override { return assert_cast<const ColumnUInt8 &>(*null_map).getData()[n] != 0;}
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
     bool getBool(size_t n) const override { return isNullAt(n) ? false : nested_column->getBool(n); }
     UInt64 get64(size_t n) const override { return nested_column->get64(n); }
     Float64 getFloat64(size_t n) const override;

src/Columns/ColumnObject.cpp

@@ -1,3 +1,5 @@
+#include <DataTypes/DataTypeObject.h>
+#include <DataTypes/DataTypesBinaryEncoding.h>
 #include <Columns/ColumnObject.h>
 #include <Columns/ColumnCompressed.h>
 #include <DataTypes/Serializations/SerializationDynamic.h>
@@ -265,6 +267,81 @@ void ColumnObject::get(size_t n, Field & res) const
     res = (*this)[n];
 }
 
+std::pair<String, DataTypePtr> ColumnObject::getValueNameAndType(size_t n) const
+{
+    WriteBufferFromOwnString wb;
+    wb << '{';
+
+    bool first = true;
+
+    for (const auto & [path, column] : typed_paths)
+    {
+        const auto & [value, type] = column->getValueNameAndType(n);
+
+        if (first)
+            first = false;
+        else
+            wb << ", ";
+
+        writeDoubleQuoted(path, wb);
+        wb << ": " << value;
+    }
+
+    for (const auto & [path, column] : dynamic_paths_ptrs)
+    {
+        /// Output only non-null values from dynamic paths. We cannot distinguish cases when
+        /// dynamic path has Null value and when it's absent in the row and consider them equivalent.
+        if (column->isNullAt(n))
+            continue;
+
+        const auto & [value, type] = column->getValueNameAndType(n);
+
+        if (first)
+            first = false;
+        else
+            wb << ", ";
+
+        writeDoubleQuoted(path, wb);
+        wb << ": " << value;
+    }
+
+    const auto & shared_data_offsets = getSharedDataOffsets();
+    const auto [shared_paths, shared_values] = getSharedDataPathsAndValues();
+    size_t start = shared_data_offsets[static_cast<ssize_t>(n) - 1];
+    size_t end = shared_data_offsets[n];
+    for (size_t i = start; i != end; ++i)
+    {
+        if (first)
+            first = false;
+        else
+            wb << ", ";
+
+        String path = shared_paths->getDataAt(i).toString();
+        writeDoubleQuoted(path, wb);
+
+        auto value_data = shared_values->getDataAt(i);
+        ReadBufferFromMemory buf(value_data.data, value_data.size);
+        auto decoded_type = decodeDataType(buf);
+
+        if (isNothing(decoded_type))
+        {
+            wb << ": NULL";
+            continue;
+        }
+
+        const auto column = decoded_type->createColumn();
+        decoded_type->getDefaultSerialization()->deserializeBinary(*column, buf, getFormatSettings());
+
+        const auto & [value, type] = column->getValueNameAndType(n);
+
+        wb << ": " << value;
+    }
+
+    wb << "}";
+
+    return {wb.str(), std::make_shared<DataTypeObject>(DataTypeObject::SchemaFormat::JSON)};
+}
+
 bool ColumnObject::isDefaultAt(size_t n) const
 {
     for (const auto & [path, column] : typed_paths)

src/Columns/ColumnObject.h

@@ -107,6 +107,7 @@ public:
 
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
 
     bool isDefaultAt(size_t n) const override;
     StringRef getDataAt(size_t n) const override;

src/Columns/ColumnObjectDeprecated.cpp

@@ -1,3 +1,6 @@
+#include <DataTypes/DataTypeObject.h>
+#include <IO/WriteBufferFromString.h>
+#include <IO/Operators.h>
 #include <Core/Field.h>
 #include <Columns/ColumnObjectDeprecated.h>
 #include <Columns/ColumnsNumber.h>
@@ -237,6 +240,33 @@ void ColumnObjectDeprecated::Subcolumn::get(size_t n, Field & res) const
     throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND, "Index ({}) for getting field is out of range", n);
 }
 
+std::pair<String, DataTypePtr> ColumnObjectDeprecated::Subcolumn::getValueNameAndType(size_t n) const
+{
+    if (isFinalized())
+        return getFinalizedColumn().getValueNameAndType(n);
+
+    size_t ind = n;
+    if (ind < num_of_defaults_in_prefix)
+        return least_common_type.get()->createColumnConstWithDefaultValue(1)->getValueNameAndType(0);
+
+    ind -= num_of_defaults_in_prefix;
+    for (const auto & part : data)
+    {
+        if (ind < part->size())
+        {
+            Field field;
+            part->get(ind, field);
+            const auto column = least_common_type.get()->createColumn();
+            column->insert(convertFieldToTypeOrThrow(field, *least_common_type.get()));
+            return column->getValueNameAndType(0);
+        }
+
+        ind -= part->size();
+    }
+
+    throw Exception(ErrorCodes::ARGUMENT_OUT_OF_BOUND, "Index ({}) for getting field is out of range", n);
+}
+
 void ColumnObjectDeprecated::Subcolumn::checkTypes() const
 {
     DataTypes prefix_types;
@@ -763,6 +793,30 @@ void ColumnObjectDeprecated::get(size_t n, Field & res) const
     }
 }
 
+std::pair<String, DataTypePtr> ColumnObjectDeprecated::getValueNameAndType(size_t n) const
+{
+    WriteBufferFromOwnString wb;
+    wb << '{';
+
+    bool first = true;
+
+    for (const auto & entry : subcolumns)
+    {
+        if (first)
+            first = false;
+        else
+            wb << ", ";
+
+        writeDoubleQuoted(entry->path.getPath(), wb);
+        const auto & [value, type] = entry->data.getValueNameAndType(n);
+        wb << ": " << value;
+    }
+
+    wb << "}";
+
+    return {wb.str(), std::make_shared<DataTypeObject>(DataTypeObject::SchemaFormat::JSON)};
+}
+
 #if !defined(DEBUG_OR_SANITIZER_BUILD)
 void ColumnObjectDeprecated::insertFrom(const IColumn & src, size_t n)
 #else

src/Columns/ColumnObjectDeprecated.h

@@ -69,6 +69,7 @@ public:
         size_t byteSize() const;
         size_t allocatedBytes() const;
         void get(size_t n, Field & res) const;
+        std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const;
 
         bool isFinalized() const;
         const DataTypePtr & getLeastCommonType() const { return least_common_type.get(); }
@@ -220,6 +221,7 @@ public:
     void popBack(size_t length) override;
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
 
     ColumnPtr permute(const Permutation & perm, size_t limit) const override;
     ColumnPtr filter(const Filter & filter, ssize_t result_size_hint) const override;

src/Columns/ColumnSparse.cpp

@@ -94,6 +94,11 @@ void ColumnSparse::get(size_t n, Field & res) const
     values->get(getValueIndex(n), res);
 }
 
+std::pair<String, DataTypePtr>  ColumnSparse::getValueNameAndType(size_t n) const
+{
+    return values->getValueNameAndType(getValueIndex(n));
+}
+
 bool ColumnSparse::getBool(size_t n) const
 {
     return values->getBool(getValueIndex(n));

src/Columns/ColumnSparse.h

@@ -65,6 +65,7 @@ public:
     bool isNullAt(size_t n) const override;
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t) const override;
     bool getBool(size_t n) const override;
     Float64 getFloat64(size_t n) const override;
     Float32 getFloat32(size_t n) const override;

src/Columns/ColumnString.h

@@ -2,6 +2,8 @@
 
 #include <cstring>
 
+#include <DataTypes/DataTypeString.h>
+#include <IO/WriteHelpers.h>
 #include <Columns/IColumn.h>
 #include <Columns/IColumnImpl.h>
 #include <Common/PODArray.h>
@@ -109,6 +111,13 @@ public:
         res = std::string_view{reinterpret_cast<const char *>(&chars[offsetAt(n)]), sizeAt(n) - 1};
     }
 
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override
+    {
+        WriteBufferFromOwnString wb;
+        writeQuoted(std::string_view{reinterpret_cast<const char *>(&chars[offsetAt(n)]), sizeAt(n) - 1}, wb);
+        return {wb.str(), std::make_shared<DataTypeString>()};
+    }
+
     StringRef getDataAt(size_t n) const override
     {
         chassert(n < size());

src/Columns/ColumnTuple.cpp

@@ -1,3 +1,4 @@
+#include <DataTypes/DataTypeTuple.h>
 #include <Columns/ColumnTuple.h>
 
 #include <Columns/ColumnCompressed.h>
@@ -148,6 +149,28 @@ void ColumnTuple::get(size_t n, Field & res) const
         res_tuple.push_back((*columns[i])[n]);
 }
 
+std::pair<String, DataTypePtr> ColumnTuple::getValueNameAndType(size_t n) const
+{
+    const size_t tuple_size = columns.size();
+
+    String value_name {tuple_size > 1 ? "(" : "tuple("};
+
+    DataTypes element_types;
+    element_types.reserve(tuple_size);
+
+    for (size_t i = 0; i < tuple_size; ++i)
+    {
+        const auto & [value, type] = columns[i]->getValueNameAndType(n);
+        element_types.push_back(type);
+        if (i > 0)
+            value_name += ", ";
+        value_name += value;
+    }
+    value_name += ")";
+
+    return {value_name, std::make_shared<DataTypeTuple>(element_types)};
+}
+
 bool ColumnTuple::isDefaultAt(size_t n) const
 {
     const size_t tuple_size = columns.size();

src/Columns/ColumnTuple.h

@@ -59,6 +59,7 @@ public:
 
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
 
     bool isDefaultAt(size_t n) const override;
     StringRef getDataAt(size_t n) const override;

src/Columns/ColumnUnique.h

@@ -74,6 +74,10 @@ public:
 
     Field operator[](size_t n) const override { return (*getNestedColumn())[n]; }
     void get(size_t n, Field & res) const override { getNestedColumn()->get(n, res); }
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override
+    {
+        return getNestedColumn()->getValueNameAndType(n);
+    }
     bool isDefaultAt(size_t n) const override { return n == 0; }
     StringRef getDataAt(size_t n) const override { return getNestedColumn()->getDataAt(n); }
     UInt64 get64(size_t n) const override { return getNestedColumn()->get64(n); }

src/Columns/ColumnVariant.cpp

@@ -1,3 +1,5 @@
+#include <DataTypes/DataTypeNothing.h>
+#include <DataTypes/DataTypeNullable.h>
 #include <Columns/ColumnVariant.h>
 
 #include <Columns/ColumnCompressed.h>
@@ -404,6 +406,15 @@ void ColumnVariant::get(size_t n, Field & res) const
         variants[discr]->get(offsetAt(n), res);
 }
 
+std::pair<String, DataTypePtr> ColumnVariant::getValueNameAndType(size_t n) const
+{
+    Discriminator discr = localDiscriminatorAt(n);
+    if (discr == NULL_DISCRIMINATOR)
+        return {"NULL",  std::make_shared<DataTypeNullable>(std::make_shared<DataTypeNothing>())};
+
+    return variants[discr]->getValueNameAndType(offsetAt(n));
+}
+
 bool ColumnVariant::isDefaultAt(size_t n) const
 {
     return localDiscriminatorAt(n) == NULL_DISCRIMINATOR;

src/Columns/ColumnVariant.h

@@ -173,6 +173,7 @@ public:
 
     Field operator[](size_t n) const override;
     void get(size_t n, Field & res) const override;
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
 
     bool isDefaultAt(size_t n) const override;
     bool isNullAt(size_t n) const override;

src/Columns/ColumnVector.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <DataTypes/FieldToDataType.h>
+#include <Common/FieldVisitorToString.h>
 #include <Columns/ColumnFixedSizeHelper.h>
 #include <Columns/IColumn.h>
 #include <Columns/IColumnImpl.h>
@@ -207,6 +209,13 @@ public:
         res = (*this)[n];
     }
 
+    std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override
+    {
+        assert(n < data.size()); /// This assert is more strict than the corresponding assert inside PODArray.
+        const auto & val = castToNearestFieldType(data[n]);
+        return {FieldVisitorToString()(val), FieldToDataType()(val)};
+    }
+
     UInt64 get64(size_t n) const override;
 
     Float64 getFloat64(size_t n) const override;

src/Columns/IColumn.h

@@ -34,6 +34,8 @@ class ColumnGathererStream;
 class Field;
 class WeakHash32;
 class ColumnConst;
+class IDataType;
+using DataTypePtr = std::shared_ptr<const IDataType>;
 
 /// A range of column values between row indexes `from` and `to`. The name "equal range" is due to table sorting as its main use case: With
 /// a PRIMARY KEY (c_pk1, c_pk2, ...), the first PK column is fully sorted. The second PK column is sorted within equal-value runs of the
@@ -144,6 +146,8 @@ public:
     /// Like the previous one, but avoids extra copying if Field is in a container, for example.
     virtual void get(size_t n, Field & res) const = 0;
 
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t) const = 0;
+
     /// If possible, returns pointer to memory chunk which contains n-th element (if it isn't possible, throws an exception)
     /// Is used to optimize some computations (in aggregation, for example).
     [[nodiscard]] virtual StringRef getDataAt(size_t n) const = 0;

src/Columns/IColumnDummy.cpp

@@ -25,6 +25,11 @@ void IColumnDummy::get(size_t, Field &) const
     throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Cannot get value from {}", getName());
 }
 
+std::pair<String, DataTypePtr> IColumnDummy::getValueNameAndType(size_t) const
+{
+    throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Cannot get value name and type from {}", getName());
+}
+
 void IColumnDummy::insert(const Field &)
 {
     throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Cannot insert element into {}", getName());

src/Columns/IColumnDummy.h

@@ -40,6 +40,7 @@ public:
 
     Field operator[](size_t) const override;
     void get(size_t, Field &) const override;
+    virtual std::pair<String, DataTypePtr> getValueNameAndType(size_t n) const override;
     void insert(const Field &) override;
     bool tryInsert(const Field &) override { return false; }
     bool isDefaultAt(size_t) const override;

src/Common/FieldVisitorToString.cpp

@@ -51,6 +51,18 @@ static inline String formatQuoted(T x)
     return wb.str();
 }
 
+template <typename T>
+static inline String formatQuoted(const Decimal<T> & x, UInt32 scale)
+{
+    WriteBufferFromOwnString wb;
+
+    writeChar('\'', wb);
+    writeText(x, scale, wb, {});
+    writeChar('\'', wb);
+
+    return wb.str();
+}
+
 /** In contrast to writeFloatText (and writeQuoted),
   *  even if number looks like integer after formatting, prints decimal point nevertheless (for example, Float64(1) is printed as 1.).
   * - because resulting text must be able to be parsed back as Float64 by query parser (otherwise it will be parsed as integer).
@@ -81,6 +93,10 @@ String FieldVisitorToString::operator() (const DecimalField<Decimal32> & x) cons
 String FieldVisitorToString::operator() (const DecimalField<Decimal64> & x) const { return formatQuoted(x); }
 String FieldVisitorToString::operator() (const DecimalField<Decimal128> & x) const { return formatQuoted(x); }
 String FieldVisitorToString::operator() (const DecimalField<Decimal256> & x) const { return formatQuoted(x); }
+String FieldVisitorToString::operator() (const Decimal32 & x, UInt32 scale) const { return formatQuoted(x, scale); }
+String FieldVisitorToString::operator() (const Decimal64 & x, UInt32 scale) const { return formatQuoted(x, scale); }
+String FieldVisitorToString::operator() (const Decimal128 & x, UInt32 scale) const { return formatQuoted(x, scale); }
+String FieldVisitorToString::operator() (const Decimal256 & x, UInt32 scale) const { return formatQuoted(x, scale); }
 String FieldVisitorToString::operator() (const Int128 & x) const { return formatQuoted(x); }
 String FieldVisitorToString::operator() (const UInt128 & x) const { return formatQuoted(x); }
 String FieldVisitorToString::operator() (const UInt256 & x) const { return formatQuoted(x); }

src/Common/FieldVisitorToString.h

@@ -29,6 +29,10 @@ public:
     String operator() (const DecimalField<Decimal64> & x) const;
     String operator() (const DecimalField<Decimal128> & x) const;
     String operator() (const DecimalField<Decimal256> & x) const;
+    String operator() (const Decimal32 & x, UInt32 scale) const;
+    String operator() (const Decimal64 & x, UInt32 scale) const;
+    String operator() (const Decimal128 & x, UInt32 scale) const;
+    String operator() (const Decimal256 & x, UInt32 scale) const;
     String operator() (const AggregateFunctionStateData & x) const;
     String operator() (const CustomType & x) const;
     String operator() (const bool & x) const;

src/DataTypes/FieldToDataType.cpp

@@ -130,6 +130,34 @@ DataTypePtr FieldToDataType<on_error>::operator() (const DecimalField<Decimal256
     return std::make_shared<Type>(Type::maxPrecision(), x.getScale());
 }
 
+template <LeastSupertypeOnError on_error>
+DataTypePtr FieldToDataType<on_error>::operator() (const Decimal32 &, UInt32 scale) const
+{
+    using Type = DataTypeDecimal<Decimal32>;
+    return std::make_shared<Type>(Type::maxPrecision(), scale);
+}
+
+template <LeastSupertypeOnError on_error>
+DataTypePtr FieldToDataType<on_error>::operator() (const Decimal64 &, UInt32 scale) const
+{
+    using Type = DataTypeDecimal<Decimal64>;
+    return std::make_shared<Type>(Type::maxPrecision(), scale);
+}
+
+template <LeastSupertypeOnError on_error>
+DataTypePtr FieldToDataType<on_error>::operator() (const Decimal128 &, UInt32 scale) const
+{
+    using Type = DataTypeDecimal<Decimal128>;
+    return std::make_shared<Type>(Type::maxPrecision(), scale);
+}
+
+template <LeastSupertypeOnError on_error>
+DataTypePtr FieldToDataType<on_error>::operator() (const Decimal256 &, UInt32 scale) const
+{
+    using Type = DataTypeDecimal<Decimal256>;
+    return std::make_shared<Type>(Type::maxPrecision(), scale);
+}
+
 template <LeastSupertypeOnError on_error>
 DataTypePtr FieldToDataType<on_error>::operator() (const Array & x) const
 {

src/DataTypes/FieldToDataType.h

@@ -40,6 +40,10 @@ public:
     DataTypePtr operator() (const DecimalField<Decimal64> & x) const;
     DataTypePtr operator() (const DecimalField<Decimal128> & x) const;
     DataTypePtr operator() (const DecimalField<Decimal256> & x) const;
+    DataTypePtr operator() (const Decimal32 & x, UInt32 scale) const;
+    DataTypePtr operator() (const Decimal64 & x, UInt32 scale) const;
+    DataTypePtr operator() (const Decimal128 & x, UInt32 scale) const;
+    DataTypePtr operator() (const Decimal256 & x, UInt32 scale) const;
     DataTypePtr operator() (const AggregateFunctionStateData & x) const;
     DataTypePtr operator() (const CustomType & x) const;
     DataTypePtr operator() (const UInt256 & x) const;

src/Planner/PlannerActionsVisitor.cpp

@@ -60,8 +60,8 @@ namespace
  */
 String calculateActionNodeNameWithCastIfNeeded(const ConstantNode & constant_node)
 {
-    const auto & [name, type, field_type] = constant_node.getFieldAttributes();
+    const auto & [name, type] = constant_node.getValueNameAndType();
-    bool requires_cast_call = constant_node.hasSourceExpression() || ConstantNode::requiresCastCall(type, field_type, constant_node.getResultType());
+    bool requires_cast_call = constant_node.hasSourceExpression() || ConstantNode::requiresCastCall(type, constant_node.getResultType());
 
     WriteBufferFromOwnString buffer;
     if (requires_cast_call)
@@ -336,7 +336,8 @@ public:
 
     static String calculateConstantActionNodeName(const ConstantNode & constant_node)
     {
-        return std::get<String>(constant_node.getFieldAttributes());
+        const auto & [name, type] = constant_node.getValueNameAndType();
+        return name + "_" + constant_node.getResultType()->getName();
     }
 
     String calculateWindowNodeActionName(const QueryTreeNodePtr & function_nodew_node_, const QueryTreeNodePtr & window_node_)