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Add generic implementation of function transform
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@ -16,6 +16,7 @@
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#include <Interpreters/convertFieldToType.h>
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#include <Common/HashTable/HashMap.h>
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#include <Common/typeid_cast.h>
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#include <Common/FieldVisitorsAccurateComparison.h>
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namespace DB
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@ -79,15 +80,6 @@ namespace
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args_size);
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const DataTypePtr & type_x = arguments[0];
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const auto & type_x_nn = removeNullable(type_x);
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if (!type_x_nn->isValueRepresentedByNumber() && !isString(type_x_nn) && !isNothing(type_x_nn))
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Unsupported type {} of first argument "
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"of function {}, must be numeric type or Date/DateTime or String",
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type_x->getName(),
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getName());
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const DataTypeArray * type_arr_from = checkAndGetDataType<DataTypeArray>(arguments[1].get());
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@ -99,14 +91,13 @@ namespace
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const auto type_arr_from_nested = type_arr_from->getNestedType();
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if ((type_x->isValueRepresentedByNumber() != type_arr_from_nested->isValueRepresentedByNumber())
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|| (isString(type_x) != isString(type_arr_from_nested)))
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auto src = tryGetLeastSupertype(DataTypes{type_x, type_arr_from_nested});
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if (!src)
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{
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"First argument and elements of array "
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"of second argument of function {} must have compatible types: "
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"both numeric or both strings.",
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"of the second argument of function {} must have compatible types",
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getName());
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}
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@ -157,8 +148,8 @@ namespace
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}
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}
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ColumnPtr
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executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
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ColumnPtr executeImpl(
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const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
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{
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initialize(arguments, result_type);
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@ -172,22 +163,36 @@ namespace
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default_non_const = castColumn(arguments[3], result_type);
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auto column_result = result_type->createColumn();
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if (!executeNum<ColumnVector<UInt8>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<UInt16>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<UInt32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<UInt64>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int8>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int16>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int64>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Float32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Float64>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnDecimal<Decimal32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnDecimal<Decimal64>>(in, *column_result, default_non_const)
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&& !executeString(in, *column_result, default_non_const))
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if (cache.table_num_to_idx)
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{
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}", in->getName(), getName());
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if (!executeNum<ColumnVector<UInt8>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<UInt16>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<UInt32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<UInt64>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int8>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int16>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Int64>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Float32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnVector<Float64>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnDecimal<Decimal32>>(in, *column_result, default_non_const)
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&& !executeNum<ColumnDecimal<Decimal64>>(in, *column_result, default_non_const))
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{
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column {} of first argument of function {}", in->getName(), getName());
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}
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}
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else if (cache.table_string_to_idx)
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{
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if (!executeString(in, *column_result, default_non_const))
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executeContiguous(in, *column_result, default_non_const);
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}
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else if (cache.table_anything_to_idx)
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{
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executeAnything(in, *column_result, default_non_const);
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}
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else
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throw Exception(ErrorCodes::LOGICAL_ERROR, "State of the function `transform` is not initialized");
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return column_result;
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}
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@ -204,6 +209,47 @@ namespace
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return impl->execute(args, result_type, input_rows_count);
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}
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void executeAnything(const IColumn * in, IColumn & column_result, const ColumnPtr default_non_const) const
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{
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const size_t size = in->size();
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const auto & table = *cache.table_anything_to_idx;
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column_result.reserve(size);
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for (size_t i = 0; i < size; ++i)
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{
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SipHash hash;
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in->updateHashWithValue(i, hash);
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const auto * it = table.find(hash.get128());
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if (it)
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column_result.insertFrom(*cache.to_column, it->getMapped());
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else if (cache.default_column)
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column_result.insertFrom(*cache.default_column, 0);
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else if (default_non_const)
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column_result.insertFrom(*default_non_const, i);
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else
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column_result.insertFrom(*in, i);
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}
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}
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void executeContiguous(const IColumn * in, IColumn & column_result, const ColumnPtr default_non_const) const
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{
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const size_t size = in->size();
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const auto & table = *cache.table_string_to_idx;
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column_result.reserve(size);
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for (size_t i = 0; i < size; ++i)
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{
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const auto * it = table.find(in->getDataAt(i));
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if (it)
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column_result.insertFrom(*cache.to_column, it->getMapped());
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else if (cache.default_column)
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column_result.insertFrom(*cache.default_column, 0);
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else if (default_non_const)
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column_result.insertFrom(*default_non_const, i);
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else
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column_result.insertFrom(*in, i);
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}
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}
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template <typename T>
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bool executeNum(const IColumn * in_untyped, IColumn & column_result, const ColumnPtr default_non_const) const
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{
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@ -593,9 +639,11 @@ namespace
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{
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using NumToIdx = HashMap<UInt64, size_t, HashCRC32<UInt64>>;
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using StringToIdx = HashMap<StringRef, size_t, StringRefHash>;
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using AnythingToIdx = HashMap<UInt128, size_t>;
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std::unique_ptr<NumToIdx> table_num_to_idx;
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std::unique_ptr<StringToIdx> table_string_to_idx;
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std::unique_ptr<AnythingToIdx> table_anything_to_idx;
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ColumnPtr from_column;
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ColumnPtr to_column;
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@ -648,18 +696,16 @@ namespace
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std::lock_guard lock(cache.mutex);
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ColumnPtr from_column_or_null_ptr = castColumnAccurateOrNull(
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const ColumnPtr & from_column_uncasted = array_from->getDataPtr();
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cache.from_column = castColumn(
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{
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array_from->getDataPtr(),
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from_column_uncasted,
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typeid_cast<const DataTypeArray &>(*arguments[1].type).getNestedType(),
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arguments[1].name
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},
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from_type);
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const ColumnNullable & from_column_or_null = assert_cast<const ColumnNullable &>(*from_column_or_null_ptr);
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cache.from_column = from_column_or_null.getNestedColumnPtr();
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cache.to_column = castColumn(
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{
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array_to->getDataPtr(),
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@ -696,13 +742,14 @@ namespace
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/// Note: Doesn't check the duplicates in the `from` array.
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if (from_type->isValueRepresentedByNumber())
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WhichDataType which(from_type);
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if (isNativeNumber(which) || which.isDecimal32() || which.isDecimal64())
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{
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cache.table_num_to_idx = std::make_unique<Cache::NumToIdx>();
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auto & table = *cache.table_num_to_idx;
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for (size_t i = 0; i < size; ++i)
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{
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if (!from_column_or_null.isNullAt(i))
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if (applyVisitor(FieldVisitorAccurateEquals(), (*cache.from_column)[i], (*from_column_uncasted)[i]))
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{
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/// Field may be of Float type, but for the purpose of bitwise equality we can treat them as UInt64
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StringRef ref = cache.from_column->getDataAt(i);
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@ -718,7 +765,7 @@ namespace
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auto & table = *cache.table_string_to_idx;
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for (size_t i = 0; i < size; ++i)
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{
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if (!from_column_or_null.isNullAt(i))
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if (applyVisitor(FieldVisitorAccurateEquals(), (*cache.from_column)[i], (*from_column_uncasted)[i]))
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{
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StringRef ref = cache.from_column->getDataAt(i);
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table[ref] = i;
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@ -726,7 +773,19 @@ namespace
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}
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}
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else
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Unexpected data type {} as the first argument in function `transform`", from_type->getName());
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{
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cache.table_anything_to_idx = std::make_unique<Cache::AnythingToIdx>();
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auto & table = *cache.table_anything_to_idx;
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for (size_t i = 0; i < size; ++i)
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{
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if (applyVisitor(FieldVisitorAccurateEquals(), (*cache.from_column)[i], (*from_column_uncasted)[i]))
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{
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SipHash hash;
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cache.from_column->updateHashWithValue(i, hash);
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table[hash.get128()] = i;
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}
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}
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}
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cache.initialized = true;
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}
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tests/queries/0_stateless/02798_generic_transform.reference
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38
tests/queries/0_stateless/02798_generic_transform.reference
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@ -0,0 +1,38 @@
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def
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def
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def
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hello
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def
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world
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def
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abc!
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def
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def
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hello
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world
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abc
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hello
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world
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abc
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123
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2023-03-03 00:00:00.000
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2023-02-02 00:00:00.000
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2023-01-01 00:00:00.000
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1 1
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42 42
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42
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42
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12
tests/queries/0_stateless/02798_generic_transform.sql
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12
tests/queries/0_stateless/02798_generic_transform.sql
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@ -0,0 +1,12 @@
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SELECT transform((number, toString(number)), [(3, '3'), (5, '5'), (7, '7')], ['hello', 'world', 'abc!'], 'def') FROM system.numbers LIMIT 10;
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SELECT transform(toNullable(toInt256(number)), [3, 5, 7], ['hello', 'world', 'abc'], '') FROM system.numbers LIMIT 10;
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SELECT transform(toUInt256(number), [3, 5, 7], ['hello', 'world', 'abc'], '') FROM system.numbers LIMIT 10;
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select case 1::Nullable(Int32) when 1 then 123 else 0 end;
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SELECT transform(arrayJoin(['c', 'b', 'a']), ['a', 'b'], [toDateTime64('2023-01-01', 3), toDateTime64('2023-02-02', 3)], toDateTime64('2023-03-03', 3));
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SELECT transform(1, [1], [toDecimal32(1, 2)]), toDecimal32(1, 2);
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select transform(1, [1], [toDecimal32(42, 2)]), toDecimal32(42, 2);
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SELECT transform(1, [1], [toDecimal32(42, 2)], 0);
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SELECT transform(1, [1], [toDecimal32(42, 2)], toDecimal32(0, 2));
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