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#include <Processors/Formats/Impl/JSONRowInputFormat.h>
#include <Formats/JSONUtils.h>
#include <Formats/FormatFactory.h>
#include <IO/ReadHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int INCORRECT_DATA;
}
JSONRowInputFormat::JSONRowInputFormat(ReadBuffer & in_, const Block & header_, Params params_, const FormatSettings & format_settings_)
: JSONEachRowRowInputFormat(in_, header_, params_, format_settings_, false), validate_types_from_metadata(format_settings_.json.validate_types_from_metadata)
{
}
void JSONRowInputFormat::readPrefix()
{
skipBOMIfExists(*in);
JSONUtils::skipObjectStart(*in);
if (validate_types_from_metadata)
JSONUtils::readMetadataAndValidateHeader(*in, getPort().getHeader());
else
JSONUtils::readMetadata(*in);
JSONUtils::skipComma(*in);
if (!JSONUtils::skipUntilFieldInObject(*in, "data"))
throw Exception(ErrorCodes::INCORRECT_DATA, "Expected field \"data\" with table content");
JSONUtils::skipArrayStart(*in);
data_in_square_brackets = true;
}
void JSONRowInputFormat::readSuffix()
{
JSONUtils::skipArrayEnd(*in);
JSONUtils::skipTheRestOfObject(*in);
}
JSONRowSchemaReader::JSONRowSchemaReader(ReadBuffer & in_) : ISchemaReader(in_)
{
}
NamesAndTypesList JSONRowSchemaReader::readSchema()
{
skipBOMIfExists(in);
JSONUtils::skipObjectStart(in);
return JSONUtils::readMetadata(in);
}
void registerInputFormatJSON(FormatFactory & factory)
{
factory.registerInputFormat("JSON", [](
ReadBuffer & buf,
const Block & sample,
IRowInputFormat::Params params,
const FormatSettings & settings)
{
return std::make_shared<JSONRowInputFormat>(buf, sample, std::move(params), settings);
});
factory.markFormatSupportsSubsetOfColumns("JSON");
}
void registerJSONSchemaReader(FormatFactory & factory)
{
auto register_schema_reader = [&](const String & format)
{
factory.registerSchemaReader(
format, [](ReadBuffer & buf, const FormatSettings &) { return std::make_unique<JSONRowSchemaReader>(buf); });
};
register_schema_reader("JSON");
/// JSONCompact has the same suffix with metadata.
register_schema_reader("JSONCompact");
}
}
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