2011-08-22 20:37:21 +00:00
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#pragma once
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#include <Poco/SharedPtr.h>
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2011-09-04 21:23:19 +00:00
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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2011-08-22 20:37:21 +00:00
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namespace DB
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{
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using Poco::SharedPtr;
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/** Реализует операции WHERE, HAVING.
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* На вход подаётся поток блоков, в котором в одном из столбцов типа ColumnUInt8 содержатся условия фильтрации.
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2011-08-28 05:13:24 +00:00
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* Возвращается поток блоков, в котором содержатся только отфильтрованные строки.
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2011-08-22 20:37:21 +00:00
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*/
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2011-09-04 21:23:19 +00:00
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class FilterBlockInputStream : public IProfilingBlockInputStream
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2011-08-22 20:37:21 +00:00
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{
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public:
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2012-10-13 02:12:50 +00:00
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/// filter_column_ - номер столбца с условиями фильтрации.
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FilterBlockInputStream(BlockInputStreamPtr input_, ssize_t filter_column_);
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2012-10-12 20:34:33 +00:00
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FilterBlockInputStream(BlockInputStreamPtr input_, const String & filter_column_name_);
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2011-09-04 21:23:19 +00:00
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2015-06-08 20:22:02 +00:00
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String getName() const override { return "Filter"; }
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2011-08-22 20:37:21 +00:00
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2014-11-08 23:52:18 +00:00
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String getID() const override
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2013-05-03 10:20:53 +00:00
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{
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std::stringstream res;
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2013-05-04 05:20:07 +00:00
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res << "Filter(" << children.back()->getID() << ", " << filter_column << ", " << filter_column_name << ")";
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2013-05-03 10:20:53 +00:00
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return res.str();
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}
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2012-10-20 02:10:47 +00:00
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protected:
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2014-11-08 23:52:18 +00:00
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Block readImpl() override;
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2012-10-20 02:10:47 +00:00
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2011-08-22 20:37:21 +00:00
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private:
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2011-08-28 05:13:24 +00:00
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ssize_t filter_column;
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2012-10-12 20:34:33 +00:00
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String filter_column_name;
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2011-08-22 20:37:21 +00:00
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};
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}
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