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docs/en/sql-reference/aggregate-functions/reference/grouparraysorted.md
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| --- | ||
| toc_priority: 108 | ||
| --- | ||
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| # groupArraySorted {#groupArraySorted} | ||
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| Returns an array with the first N items in ascending order. | ||
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| ``` sql | ||
| groupArraySorted(N)(column) | ||
| ``` | ||
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| **Arguments** | ||
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| - `N` – The number of elements to return. | ||
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| If the parameter is omitted, default value 10 is used. | ||
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| **Arguments** | ||
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| - `column` – The value. | ||
| - `expr` — Optional. The field or expresion to sort by. If not set values are sorted by themselves. | ||
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| **Example** | ||
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| Gets the first 10 numbers: | ||
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| ``` sql | ||
| SELECT groupArraySorted(10)(number) FROM numbers(100) | ||
| ``` | ||
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| ``` text | ||
| ┌─groupArraySorted(10)(number)─┐ | ||
| │ [0,1,2,3,4,5,6,7,8,9] │ | ||
| └──────────────────────────────┘ | ||
| ``` | ||
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| Or the last 10: | ||
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| ``` sql | ||
| SELECT groupArraySorted(10)(number, -number) FROM numbers(100) | ||
| ``` | ||
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| ``` text | ||
| ┌─groupArraySorted(10)(number, negate(number))─┐ | ||
| │ [99,98,97,96,95,94,93,92,91,90] │ | ||
| └──────────────────────────────────────────────┘ | ||
| ``` |
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src/AggregateFunctions/AggregateFunctionGroupArraySorted.cpp
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| #include <AggregateFunctions/AggregateFunctionFactory.h> | ||
| #include <AggregateFunctions/AggregateFunctionGroupArraySorted.h> | ||
| #include <AggregateFunctions/FactoryHelpers.h> | ||
| #include <AggregateFunctions/Helpers.h> | ||
| #include <DataTypes/DataTypeDate.h> | ||
| #include <DataTypes/DataTypeDateTime.h> | ||
| #include <DataTypes/DataTypeString.h> | ||
| #include <Common/FieldVisitorConvertToNumber.h> | ||
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| static inline constexpr UInt64 GROUP_SORTED_ARRAY_MAX_SIZE = 0xFFFFFF; | ||
| static inline constexpr UInt64 GROUP_SORTED_ARRAY_DEFAULT_THRESHOLD = 10; | ||
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| namespace DB | ||
| { | ||
| struct Settings; | ||
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| namespace ErrorCodes | ||
| { | ||
| extern const int ARGUMENT_OUT_OF_BOUND; | ||
| extern const int ILLEGAL_TYPE_OF_ARGUMENT; | ||
| extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH; | ||
| } | ||
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| namespace | ||
| { | ||
| template <typename T, bool expr_sorted, typename TColumnB, bool is_plain_b> | ||
| class AggregateFunctionGroupArraySortedNumeric : public AggregateFunctionGroupArraySorted<T, false, expr_sorted, TColumnB, is_plain_b> | ||
| { | ||
| using AggregateFunctionGroupArraySorted<T, false, expr_sorted, TColumnB, is_plain_b>::AggregateFunctionGroupArraySorted; | ||
| }; | ||
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| template <typename T, bool expr_sorted, typename TColumnB, bool is_plain_b> | ||
| class AggregateFunctionGroupArraySortedFieldType | ||
| : public AggregateFunctionGroupArraySorted<typename T::FieldType, false, expr_sorted, TColumnB, is_plain_b> | ||
| { | ||
| using AggregateFunctionGroupArraySorted<typename T::FieldType, false, expr_sorted, TColumnB, is_plain_b>:: | ||
| AggregateFunctionGroupArraySorted; | ||
| DataTypePtr getReturnType() const override { return std::make_shared<DataTypeArray>(std::make_shared<T>()); } | ||
| }; | ||
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| template <template <typename, bool, typename, bool> class AggregateFunctionTemplate, typename TColumnA, bool expr_sorted, typename TColumnB, bool is_plain_b, typename... TArgs> | ||
| AggregateFunctionPtr | ||
| createAggregateFunctionGroupArraySortedTypedFinal(TArgs && ... args) | ||
| { | ||
| return AggregateFunctionPtr(new AggregateFunctionTemplate<TColumnA, expr_sorted, TColumnB, is_plain_b>(std::forward<TArgs>(args)...)); | ||
| } | ||
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| template <bool expr_sorted = false, typename TColumnB = UInt64, bool is_plain_b = false> | ||
| AggregateFunctionPtr | ||
| createAggregateFunctionGroupArraySortedTyped(const DataTypes & argument_types, const Array & params, UInt64 threshold) | ||
| { | ||
| #define DISPATCH(A, C, B) \ | ||
| if (which.idx == TypeIndex::A) \ | ||
| return createAggregateFunctionGroupArraySortedTypedFinal<C, B, expr_sorted, TColumnB, is_plain_b>(threshold, argument_types, params); | ||
| #define DISPATCH_NUMERIC(A) DISPATCH(A, AggregateFunctionGroupArraySortedNumeric, A) | ||
| WhichDataType which(argument_types[0]); | ||
| FOR_NUMERIC_TYPES(DISPATCH_NUMERIC) | ||
| DISPATCH(Enum8, AggregateFunctionGroupArraySortedNumeric, Int8) | ||
| DISPATCH(Enum16, AggregateFunctionGroupArraySortedNumeric, Int16) | ||
| DISPATCH(Date, AggregateFunctionGroupArraySortedFieldType, DataTypeDate) | ||
| DISPATCH(DateTime, AggregateFunctionGroupArraySortedFieldType, DataTypeDateTime) | ||
| #undef DISPATCH | ||
| #undef DISPATCH_NUMERIC | ||
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| if (argument_types[0]->isValueUnambiguouslyRepresentedInContiguousMemoryRegion()) | ||
| { | ||
| return AggregateFunctionPtr(new AggregateFunctionGroupArraySorted<StringRef, true, expr_sorted, TColumnB, is_plain_b>( | ||
| threshold, argument_types, params)); | ||
| } | ||
| else | ||
| { | ||
| return AggregateFunctionPtr(new AggregateFunctionGroupArraySorted<StringRef, false, expr_sorted, TColumnB, is_plain_b>( | ||
| threshold, argument_types, params)); | ||
| } | ||
| } | ||
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| AggregateFunctionPtr createAggregateFunctionGroupArraySorted( | ||
| const std::string & name, const DataTypes & argument_types, const Array & params, const Settings *) | ||
| { | ||
| UInt64 threshold = GROUP_SORTED_ARRAY_DEFAULT_THRESHOLD; | ||
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| if (params.size() == 1) | ||
| { | ||
| UInt64 k = applyVisitor(FieldVisitorConvertToNumber<UInt64>(), params[0]); | ||
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| if (k > GROUP_SORTED_ARRAY_MAX_SIZE) | ||
| throw Exception( | ||
| "Too large parameter(s) for aggregate function " + name + ". Maximum: " + toString(GROUP_SORTED_ARRAY_MAX_SIZE), | ||
| ErrorCodes::ARGUMENT_OUT_OF_BOUND); | ||
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| if (k == 0) | ||
| throw Exception("Parameter 0 is illegal for aggregate function " + name, ErrorCodes::ARGUMENT_OUT_OF_BOUND); | ||
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| threshold = k; | ||
| } | ||
| else if (!params.empty()) | ||
| { | ||
| throw Exception("Aggregate function " + name + " only supports 1 parameter.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH); | ||
| } | ||
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| if (argument_types.size() == 2) | ||
| { | ||
| if (isNumber(argument_types[1])) | ||
| { | ||
| #define DISPATCH2(A, B) \ | ||
| if (which.idx == TypeIndex::A) \ | ||
| return createAggregateFunctionGroupArraySortedTyped<true, B>(argument_types, params, threshold); | ||
| #define DISPATCH(A) DISPATCH2(A, A) | ||
| WhichDataType which(argument_types[1]); | ||
| FOR_NUMERIC_TYPES(DISPATCH) | ||
| DISPATCH2(Enum8, Int8) | ||
| DISPATCH2(Enum16, Int16) | ||
| #undef DISPATCH | ||
| #undef DISPATCH2 | ||
| throw Exception("Invalid parameter type.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT); | ||
| } | ||
| else if (argument_types[1]->isValueUnambiguouslyRepresentedInContiguousMemoryRegion()) | ||
| { | ||
| return createAggregateFunctionGroupArraySortedTyped<true, StringRef, true>(argument_types, params, threshold); | ||
| } | ||
| else | ||
| { | ||
| return createAggregateFunctionGroupArraySortedTyped<true, StringRef, false>(argument_types, params, threshold); | ||
| } | ||
| } | ||
| else if (argument_types.size() == 1) | ||
| { | ||
| return createAggregateFunctionGroupArraySortedTyped<>(argument_types, params, threshold); | ||
| } | ||
| else | ||
| { | ||
| throw Exception( | ||
| "Aggregate function " + name + " requires one or two parameters.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH); | ||
| } | ||
| } | ||
| } | ||
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| void registerAggregateFunctionGroupArraySorted(AggregateFunctionFactory & factory) | ||
| { | ||
| AggregateFunctionProperties properties = {.returns_default_when_only_null = false, .is_order_dependent = true}; | ||
| factory.registerFunction("groupArraySorted", {createAggregateFunctionGroupArraySorted, properties}); | ||
| } | ||
| } |
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