dynamic subcolumns: new format and several fixes

src/Columns/ColumnObject.cpp

@@ -7,7 +7,9 @@
 #include <DataTypes/DataTypesNumber.h>
 #include <Interpreters/castColumn.h>
 
-#include <Common/FieldVisitors.h>
+#include <boost/algorithm/string/split.hpp>
+#include <boost/algorithm/string.hpp>
+
 
 namespace DB
 {
@@ -169,6 +171,17 @@ Names ColumnObject::getKeys() const
     return keys;
 }
 
+static bool isPrefix(const Strings & prefix, const Strings & strings)
+{
+    if (prefix.size() > strings.size())
+        return false;
+
+    for (size_t i = 0; i < prefix.size(); ++i)
+        if (prefix[i] != strings[i])
+            return false;
+    return true;
+}
+
 void ColumnObject::optimizeTypesOfSubcolumns()
 {
     if (optimized_types_of_subcolumns)
@@ -184,11 +197,20 @@ void ColumnObject::optimizeTypesOfSubcolumns()
         if (isNothing(getBaseTypeOfArray(to_type)))
             continue;
 
-        auto it = std::find_if(subcolumns.begin(), subcolumns.end(),
-            [&name = name](const auto & elem) { return elem.first.size() > name.size() && startsWith(elem.first, name); });
+        Strings name_parts;
+        boost::split(name_parts, name, boost::is_any_of("."));
 
-        if (it != subcolumns.end())
-            throw Exception(ErrorCodes::DUPLICATE_COLUMN, "Data in Object has ambiguous paths: '{}' and '{}", name, it->first);
+        for (const auto & [other_name, _] : subcolumns)
+        {
+            if (other_name.size() > name.size())
+            {
+                Strings other_name_parts;
+                boost::split(other_name_parts, other_name, boost::is_any_of("."));
+
+                if (isPrefix(name_parts, other_name_parts))
+                    throw Exception(ErrorCodes::DUPLICATE_COLUMN, "Data in Object has ambiguous paths: '{}' and '{}", name, other_name);
+            }
+        }
 
         if (to_type->equals(*from_type))
         {

src/Columns/IColumnImpl.h

@@ -151,7 +151,7 @@ double IColumn::getRatioOfDefaultRowsImpl(double sample_ratio) const
         return 0.0;
 
     size_t step = num_rows / num_sampled_rows;
-    std::uniform_int_distribution<size_t> dist(1, step);
+    std::uniform_int_distribution<size_t> dist(0, step - 1);
 
     size_t res = 0;
     for (size_t i = 0; i < num_rows; i += step)

src/DataTypes/FieldToDataType.cpp

@@ -109,7 +109,7 @@ DataTypePtr FieldToDataType::operator() (const Array & x) const
     element_types.reserve(x.size());
 
     for (const Field & elem : x)
-        element_types.emplace_back(applyVisitor(FieldToDataType(), elem));
+        element_types.emplace_back(applyVisitor(FieldToDataType(allow_convertion_to_string), elem));
 
     return std::make_shared<DataTypeArray>(getLeastSupertype(element_types, allow_convertion_to_string));
 }
@@ -124,7 +124,7 @@ DataTypePtr FieldToDataType::operator() (const Tuple & tuple) const
     element_types.reserve(ext::size(tuple));
 
     for (const auto & element : tuple)
-        element_types.push_back(applyVisitor(FieldToDataType(), element));
+        element_types.push_back(applyVisitor(FieldToDataType(allow_convertion_to_string), element));
 
     return std::make_shared<DataTypeTuple>(element_types);
 }
@@ -140,8 +140,8 @@ DataTypePtr FieldToDataType::operator() (const Map & map) const
     {
         const auto & tuple = elem.safeGet<const Tuple &>();
         assert(tuple.size() == 2);
-        key_types.push_back(applyVisitor(FieldToDataType(), tuple[0]));
-        value_types.push_back(applyVisitor(FieldToDataType(), tuple[1]));
+        key_types.push_back(applyVisitor(FieldToDataType(allow_convertion_to_string), tuple[0]));
+        value_types.push_back(applyVisitor(FieldToDataType(allow_convertion_to_string), tuple[1]));
     }
 
     return std::make_shared<DataTypeMap>(

src/DataTypes/Serializations/SerializationObject.cpp

@@ -28,6 +28,7 @@ namespace ErrorCodes
 
 namespace
 {
+
 class FieldVisitorReplaceNull : public StaticVisitor<Field>
 {
 public:

src/Formats/registerFormats.cpp

@@ -15,6 +15,7 @@ void registerFileSegmentationEngineCSV(FormatFactory & factory);
 void registerFileSegmentationEngineJSONEachRow(FormatFactory & factory);
 void registerFileSegmentationEngineRegexp(FormatFactory & factory);
 void registerFileSegmentationEngineJSONAsString(FormatFactory & factory);
+void registerFileSegmentationEngineJSONAsObject(FormatFactory & factory);
 
 /// Formats for both input/output.
 
@@ -76,6 +77,7 @@ void registerOutputFormatProcessorPostgreSQLWire(FormatFactory & factory);
 
 void registerInputFormatProcessorRegexp(FormatFactory & factory);
 void registerInputFormatProcessorJSONAsString(FormatFactory & factory);
+void registerInputFormatProcessorJSONAsObject(FormatFactory & factory);
 void registerInputFormatProcessorLineAsString(FormatFactory & factory);
 void registerInputFormatProcessorCapnProto(FormatFactory & factory);
 
@@ -89,6 +91,7 @@ void registerFormats()
     registerFileSegmentationEngineJSONEachRow(factory);
     registerFileSegmentationEngineRegexp(factory);
     registerFileSegmentationEngineJSONAsString(factory);
+    registerFileSegmentationEngineJSONAsObject(factory);
 
     registerInputFormatNative(factory);
     registerOutputFormatNative(factory);
@@ -147,6 +150,7 @@ void registerFormats()
 
     registerInputFormatProcessorRegexp(factory);
     registerInputFormatProcessorJSONAsString(factory);
+    registerInputFormatProcessorJSONAsObject(factory);
     registerInputFormatProcessorLineAsString(factory);
 
 #if !defined(ARCADIA_BUILD)

src/Interpreters/TreeRewriter.cpp

@@ -452,7 +452,7 @@ void getArrayJoinedColumns(ASTPtr & query, TreeRewriterResult & result, const AS
                 bool found = false;
                 for (const auto & column : source_columns)
                 {
-                    auto split = Nested::splitName(column.name);
+                    auto split = Nested::splitName(column.name, /*reverse=*/ true);
                     if (split.first == source_name && !split.second.empty())
                     {
                         result.array_join_result_to_source[Nested::concatenateName(result_name, split.second)] = column.name;

src/Processors/Formats/Impl/JSONAsObjectRowInputFormat.cpp

@@ -0,0 +1,84 @@
+#include <Processors/Formats/IRowInputFormat.h>
+#include <Formats/FormatSettings.h>
+#include <Formats/FormatFactory.h>
+#include <Formats/JSONEachRowUtils.h>
+#include <Common/assert_cast.h>
+#include <IO/ReadHelpers.h>
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int BAD_ARGUMENTS;
+}
+
+namespace
+{
+
+class JSONAsObjectRowInputFormat : public IRowInputFormat
+{
+public:
+    JSONAsObjectRowInputFormat(ReadBuffer & in_, const Block & header_, Params params_, const FormatSettings & format_settings_);
+
+    bool readRow(MutableColumns & columns, RowReadExtension & ext) override;
+    String getName() const override { return "JSONAsObjectRowInputFormat"; }
+
+private:
+    const FormatSettings format_settings;
+};
+
+JSONAsObjectRowInputFormat::JSONAsObjectRowInputFormat(
+    ReadBuffer & in_, const Block & header_, Params params_, const FormatSettings & format_settings_)
+    : IRowInputFormat(header_, in_, std::move(params_))
+    , format_settings(format_settings_)
+{
+    if (header_.columns() != 1)
+        throw Exception(ErrorCodes::BAD_ARGUMENTS,
+            "Input format JSONAsObject is only suitable for tables with a single column of type Object but the number of columns is {}",
+            header_.columns());
+
+    if (!isObject(header_.getByPosition(0).type))
+        throw Exception(ErrorCodes::BAD_ARGUMENTS,
+            "Input format JSONAsObject is only suitable for tables with a single column of type Object but the column type is {}",
+            header_.getByPosition(0).type->getName());
+}
+
+
+bool JSONAsObjectRowInputFormat::readRow(MutableColumns & columns, RowReadExtension &)
+{
+    assert(serializations.size() == 1);
+    assert(columns.size() == 1);
+
+    skipWhitespaceIfAny(in);
+    if (!in.eof())
+        serializations[0]->deserializeTextJSON(*columns[0], in, format_settings);
+
+    skipWhitespaceIfAny(in);
+    if (!in.eof() && *in.position() == ',')
+        ++in.position();
+    skipWhitespaceIfAny(in);
+
+    return !in.eof();
+}
+
+}
+
+void registerInputFormatProcessorJSONAsObject(FormatFactory & factory)
+{
+    factory.registerInputFormatProcessor("JSONAsObject", [](
+        ReadBuffer & buf,
+        const Block & sample,
+        IRowInputFormat::Params params,
+        const FormatSettings & settings)
+    {
+        return std::make_shared<JSONAsObjectRowInputFormat>(buf, sample, std::move(params), settings);
+    });
+}
+
+void registerFileSegmentationEngineJSONAsObject(FormatFactory & factory)
+{
+    factory.registerFileSegmentationEngine("JSONAsObject", &fileSegmentationEngineJSONEachRowImpl);
+}
+
+}

tests/queries/0_stateless/01825_type_json.sh

@@ -1,40 +0,0 @@
-#!/usr/bin/env bash
-
-CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
-# shellcheck source=../shell_config.sh
-. "$CUR_DIR"/../shell_config.sh
-
-set -e
-
-$CLICKHOUSE_CLIENT -q "DROP TABLE IF EXISTS t_json"
-$CLICKHOUSE_CLIENT -q "CREATE TABLE t_json(id UInt64, data Object('JSON')) \
-    ENGINE = MergeTree ORDER BY tuple() SETTINGS min_bytes_for_wide_part = 0"
-
-cat << EOF | $CLICKHOUSE_CLIENT -q  "INSERT INTO t_json FORMAT CSV"
-1,{"k1":"aa","k2":{"k3":"bb","k4":"c"}}
-2,{"k1":"ee","k5":"ff"}
-EOF
-
-cat << EOF | $CLICKHOUSE_CLIENT -q  "INSERT INTO t_json FORMAT CSV"
-3,{"k5":"foo"}
-EOF
-
-$CLICKHOUSE_CLIENT -q "SELECT id, data.k1, data.k2.k3, data.k2.k4, data.k5 FROM t_json ORDER BY id"
-$CLICKHOUSE_CLIENT -q "SELECT name, column, type \
-    FROM system.parts_columns WHERE table = 't_json' AND database = '$CLICKHOUSE_DATABASE' ORDER BY name"
-
-$CLICKHOUSE_CLIENT -q "DROP TABLE IF EXISTS t_json"
-
-$CLICKHOUSE_CLIENT -q "CREATE TABLE t_json(id UInt64, data Object('JSON')) \
-    ENGINE = MergeTree ORDER BY tuple() SETTINGS min_bytes_for_wide_part = 0"
-
-cat << EOF | $CLICKHOUSE_CLIENT -q  "INSERT INTO t_json FORMAT CSV"
-1,{"k1":[{"k2":"aaa","k3":[{"k4":"bbb"},{"k4":"ccc"}]},{"k2":"ddd","k3":[{"k4":"eee"},{"k4":"fff"}]}]}
-EOF
-
-$CLICKHOUSE_CLIENT -q "SELECT id, data.k1.k2, data.k1.k3.k4 FROM t_json ORDER BY id"
-
-$CLICKHOUSE_CLIENT -q "SELECT name, column, type \
-    FROM system.parts_columns WHERE table = 't_json' AND database = '$CLICKHOUSE_DATABASE' ORDER BY name"
-
-$CLICKHOUSE_CLIENT -q "DROP TABLE IF EXISTS t_json"