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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
#include "ASTColumnsMatcher.h"
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#include <IO/WriteHelpers.h>
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#include <Common/quoteString.h>
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#include <re2/re2.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int CANNOT_COMPILE_REGEXP;
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}
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ASTPtr ASTColumnsMatcher::clone() const
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{
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auto clone = std::make_shared<ASTColumnsMatcher>(*this);
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clone->cloneChildren();
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return clone;
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}
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void ASTColumnsMatcher::appendColumnName(WriteBuffer & ostr) const { writeString(original_pattern, ostr); }
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void ASTColumnsMatcher::formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const
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{
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settings.ostr << (settings.hilite ? hilite_keyword : "") << "COLUMNS" << (settings.hilite ? hilite_none : "") << "("
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<< quoteString(original_pattern) << ")";
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}
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void ASTColumnsMatcher::setPattern(String pattern)
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{
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original_pattern = std::move(pattern);
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column_matcher = std::make_shared<RE2>(original_pattern, RE2::Quiet);
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if (!column_matcher->ok())
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throw DB::Exception("COLUMNS pattern " + original_pattern + " cannot be compiled: " + column_matcher->error(), DB::ErrorCodes::CANNOT_COMPILE_REGEXP);
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}
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bool ASTColumnsMatcher::isColumnMatching(const String & column_name) const
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{
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return RE2::PartialMatch(column_name, *column_matcher);
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}
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}
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