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37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
#pragma once
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#include <TableFunctions/ITableFunction.h>
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namespace DB
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{
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/* generateRandom([structure, max_array_length, max_string_length, random_seed])
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* - creates a temporary storage that generates columns with random data
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*/
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class TableFunctionGenerateRandom : public ITableFunction
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{
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public:
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static constexpr auto name = "generateRandom";
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std::string getName() const override { return name; }
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bool hasStaticStructure() const override { return structure != "auto"; }
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bool needStructureHint() const override { return structure == "auto"; }
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void setStructureHint(const ColumnsDescription & structure_hint_) override { structure_hint = structure_hint_; }
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private:
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StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
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const char * getStorageTypeName() const override { return "GenerateRandom"; }
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ColumnsDescription getActualTableStructure(ContextPtr context) const override;
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void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
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String structure = "auto";
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UInt64 max_string_length = 10;
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UInt64 max_array_length = 10;
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std::optional<UInt64> random_seed;
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ColumnsDescription structure_hint;
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};
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}
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