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53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
#pragma once
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#include <Core/Block.h>
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#include <Storages/IStorage_fwd.h>
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#include <Parsers/IAST.h>
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#include <Interpreters/IJoin.h>
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#include <Interpreters/PreparedSets.h>
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namespace DB
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{
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class InterpreterSelectWithUnionQuery;
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class ExpressionActions;
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using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
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/// Information on what to do when executing a subquery in the [GLOBAL] IN/JOIN section.
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struct SubqueryForSet
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{
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/// The source is obtained using the InterpreterSelectQuery subquery.
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BlockInputStreamPtr source;
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/// If set, build it from result.
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SetPtr set;
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JoinPtr join;
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/// Apply this actions to joined block.
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ExpressionActionsPtr joined_block_actions;
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Block sample_block; /// source->getHeader() + column renames
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/// If set, put the result into the table.
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/// This is a temporary table for transferring to remote servers for distributed query processing.
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StoragePtr table;
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void makeSource(std::shared_ptr<InterpreterSelectWithUnionQuery> & interpreter,
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NamesWithAliases && joined_block_aliases_);
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void setJoinActions(ExpressionActionsPtr actions);
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bool insertJoinedBlock(Block & block);
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void setTotals();
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private:
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NamesWithAliases joined_block_aliases; /// Rename column from joined block from this list.
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/// Rename source right table column names into qualified column names if they conflicts with left table ones.
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void renameColumns(Block & block);
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};
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/// ID of subquery -> what to do with it.
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using SubqueriesForSets = std::unordered_map<String, SubqueryForSet>;
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}
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