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65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
#include <Interpreters/InterpreterExplainQuery.h>
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#include <DataStreams/BlockIO.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <DataTypes/DataTypeString.h>
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#include <Interpreters/InterpreterSelectWithUnionQuery.h>
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#include <Parsers/ASTExplainQuery.h>
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#include <Parsers/DumpASTNode.h>
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#include <Parsers/queryToString.h>
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#include <Common/typeid_cast.h>
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#include <sstream>
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namespace DB
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{
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BlockIO InterpreterExplainQuery::execute()
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{
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BlockIO res;
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res.in = executeImpl();
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return res;
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}
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Block InterpreterExplainQuery::getSampleBlock()
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{
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Block block;
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ColumnWithTypeAndName col;
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col.name = "explain";
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col.type = std::make_shared<DataTypeString>();
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col.column = col.type->createColumn();
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block.insert(col);
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return block;
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}
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BlockInputStreamPtr InterpreterExplainQuery::executeImpl()
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{
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const auto & ast = query->as<ASTExplainQuery &>();
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Block sample_block = getSampleBlock();
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MutableColumns res_columns = sample_block.cloneEmptyColumns();
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std::stringstream ss;
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if (ast.getKind() == ASTExplainQuery::ParsedAST)
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{
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dumpAST(ast, ss);
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}
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else if (ast.getKind() == ASTExplainQuery::AnalyzedSyntax)
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{
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InterpreterSelectWithUnionQuery interpreter(ast.children.at(0), context,
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SelectQueryOptions(QueryProcessingStage::FetchColumns).analyze().modify());
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interpreter.getQuery()->format(IAST::FormatSettings(ss, false));
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}
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res_columns[0]->insert(ss.str());
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return std::make_shared<OneBlockInputStream>(sample_block.cloneWithColumns(std::move(res_columns)));
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}
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}
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