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42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
#pragma once
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#include <Core/Block.h>
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#include <DataStreams/IRowInputStream.h>
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#include <Common/HashTable/HashMap.h>
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namespace DB
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{
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class ReadBuffer;
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/** A stream for reading data in JSON format, where each row is represented by a separate JSON object.
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* Objects can be separated by feed return, other whitespace characters in any number and possibly a comma.
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* Fields can be listed in any order (including, in different lines there may be different order),
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* and some fields may be missing.
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*/
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class JSONEachRowRowInputStream : public IRowInputStream
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{
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public:
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JSONEachRowRowInputStream(ReadBuffer & istr_, const Block & sample_, bool skip_unknown_);
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bool read(Block & block) override;
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bool allowSyncAfterError() const override { return true; };
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void syncAfterError() override;
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private:
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ReadBuffer & istr;
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const Block sample;
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bool skip_unknown;
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/// Buffer for the read from the stream field name. Used when you have to copy it.
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String name_buf;
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/// Hash table match `field name -> position in the block`. NOTE You can use perfect hash map.
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using NameMap = HashMap<StringRef, size_t, StringRefHash>;
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NameMap name_map;
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};
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}
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