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https://github.com/ClickHouse/ClickHouse.git
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432 lines
13 KiB
C++
432 lines
13 KiB
C++
#include <map>
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#include "ASTColumnsTransformers.h"
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#include <IO/WriteHelpers.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Common/SipHash.h>
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#include <Common/quoteString.h>
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#include <Common/re2.h>
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#include <IO/Operators.h>
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#include <stack>
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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 ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int NO_SUCH_COLUMN_IN_TABLE;
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extern const int CANNOT_COMPILE_REGEXP;
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}
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void ASTColumnsTransformerList::formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
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{
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for (const auto & child : children)
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{
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settings.ostr << ' ';
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child->formatImpl(settings, state, frame);
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}
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}
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void IASTColumnsTransformer::transform(const ASTPtr & transformer, ASTs & nodes)
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{
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if (const auto * apply = transformer->as<ASTColumnsApplyTransformer>())
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{
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apply->transform(nodes);
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}
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else if (const auto * except = transformer->as<ASTColumnsExceptTransformer>())
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{
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except->transform(nodes);
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}
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else if (const auto * replace = transformer->as<ASTColumnsReplaceTransformer>())
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{
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replace->transform(nodes);
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}
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}
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void ASTColumnsApplyTransformer::formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
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{
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settings.ostr << (settings.hilite ? hilite_keyword : "") << "APPLY" << (settings.hilite ? hilite_none : "") << " ";
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if (!column_name_prefix.empty())
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settings.ostr << "(";
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if (lambda)
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{
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lambda->formatImpl(settings, state, frame);
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}
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else
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{
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settings.ostr << func_name;
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if (parameters)
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{
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auto nested_frame = frame;
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nested_frame.expression_list_prepend_whitespace = false;
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settings.ostr << "(";
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parameters->formatImpl(settings, state, nested_frame);
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settings.ostr << ")";
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}
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}
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if (!column_name_prefix.empty())
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settings.ostr << ", '" << column_name_prefix << "')";
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}
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void ASTColumnsApplyTransformer::transform(ASTs & nodes) const
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{
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for (auto & column : nodes)
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{
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String name;
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auto alias = column->tryGetAlias();
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if (!alias.empty())
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name = alias;
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else
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{
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if (const auto * id = column->as<ASTIdentifier>())
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name = id->shortName();
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else
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name = column->getColumnName();
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}
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if (lambda)
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{
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auto body = lambda->as<const ASTFunction &>().arguments->children.at(1)->clone();
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std::stack<ASTPtr> stack;
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stack.push(body);
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while (!stack.empty())
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{
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auto ast = stack.top();
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stack.pop();
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for (auto & child : ast->children)
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{
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if (auto arg_name = tryGetIdentifierName(child); arg_name && arg_name == lambda_arg)
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{
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child = column->clone();
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continue;
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}
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stack.push(child);
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}
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}
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column = body;
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}
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else
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{
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auto function = makeASTFunction(func_name, column);
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function->parameters = parameters;
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column = function;
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}
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if (!column_name_prefix.empty())
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column->setAlias(column_name_prefix + name);
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}
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}
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void ASTColumnsApplyTransformer::appendColumnName(WriteBuffer & ostr) const
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{
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writeCString("APPLY ", ostr);
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if (!column_name_prefix.empty())
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writeChar('(', ostr);
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if (lambda)
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lambda->appendColumnName(ostr);
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else
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{
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writeString(func_name, ostr);
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if (parameters)
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parameters->appendColumnName(ostr);
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}
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if (!column_name_prefix.empty())
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{
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writeCString(", '", ostr);
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writeString(column_name_prefix, ostr);
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writeCString("')", ostr);
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}
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}
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void ASTColumnsApplyTransformer::updateTreeHashImpl(SipHash & hash_state, bool ignore_aliases) const
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{
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hash_state.update(func_name.size());
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hash_state.update(func_name);
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if (parameters)
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parameters->updateTreeHashImpl(hash_state, ignore_aliases);
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if (lambda)
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lambda->updateTreeHashImpl(hash_state, ignore_aliases);
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hash_state.update(lambda_arg.size());
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hash_state.update(lambda_arg);
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hash_state.update(column_name_prefix.size());
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hash_state.update(column_name_prefix);
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IAST::updateTreeHashImpl(hash_state, ignore_aliases);
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}
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void ASTColumnsExceptTransformer::formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
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{
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settings.ostr << (settings.hilite ? hilite_keyword : "") << "EXCEPT" << (is_strict ? " STRICT " : " ") << (settings.hilite ? hilite_none : "");
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if (children.size() > 1)
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settings.ostr << "(";
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for (ASTs::const_iterator it = children.begin(); it != children.end(); ++it)
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{
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if (it != children.begin())
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{
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settings.ostr << ", ";
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}
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(*it)->formatImpl(settings, state, frame);
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}
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if (!original_pattern.empty())
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settings.ostr << quoteString(original_pattern);
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if (children.size() > 1)
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settings.ostr << ")";
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}
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void ASTColumnsExceptTransformer::appendColumnName(WriteBuffer & ostr) const
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{
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writeCString("EXCEPT ", ostr);
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if (is_strict)
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writeCString("STRICT ", ostr);
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if (children.size() > 1)
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writeChar('(', ostr);
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for (ASTs::const_iterator it = children.begin(); it != children.end(); ++it)
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{
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if (it != children.begin())
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writeCString(", ", ostr);
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(*it)->appendColumnName(ostr);
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}
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if (!original_pattern.empty())
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writeQuotedString(original_pattern, ostr);
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if (children.size() > 1)
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writeChar(')', ostr);
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}
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void ASTColumnsExceptTransformer::updateTreeHashImpl(SipHash & hash_state, bool ignore_aliases) const
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{
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hash_state.update(is_strict);
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hash_state.update(original_pattern.size());
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hash_state.update(original_pattern);
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IAST::updateTreeHashImpl(hash_state, ignore_aliases);
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}
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void ASTColumnsExceptTransformer::transform(ASTs & nodes) const
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{
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std::set<String> expected_columns;
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if (original_pattern.empty())
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{
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for (const auto & child : children)
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expected_columns.insert(child->as<const ASTIdentifier &>().name());
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for (auto * it = nodes.begin(); it != nodes.end();)
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{
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if (const auto * id = it->get()->as<ASTIdentifier>())
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{
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auto expected_column = expected_columns.find(id->shortName());
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if (expected_column != expected_columns.end())
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{
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expected_columns.erase(expected_column);
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it = nodes.erase(it);
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continue;
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}
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}
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++it;
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}
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}
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else
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{
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for (auto * it = nodes.begin(); it != nodes.end();)
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{
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if (const auto * id = it->get()->as<ASTIdentifier>())
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{
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if (isColumnMatching(id->shortName()))
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{
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it = nodes.erase(it);
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continue;
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}
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}
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++it;
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}
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}
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if (is_strict && !expected_columns.empty())
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{
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String expected_columns_str;
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std::for_each(expected_columns.begin(), expected_columns.end(),
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[&](String x) { expected_columns_str += (" " + x) ; });
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throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE, "Columns transformer EXCEPT expects following column(s) :{}",
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expected_columns_str);
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}
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}
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void ASTColumnsExceptTransformer::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(DB::ErrorCodes::CANNOT_COMPILE_REGEXP, "COLUMNS pattern {} cannot be compiled: {}",
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original_pattern, column_matcher->error());
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}
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const std::shared_ptr<re2::RE2> & ASTColumnsExceptTransformer::getMatcher() const
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{
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return column_matcher;
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}
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bool ASTColumnsExceptTransformer::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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void ASTColumnsReplaceTransformer::Replacement::formatImpl(
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const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
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{
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assert(children.size() == 1);
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children[0]->formatImpl(settings, state, frame);
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settings.ostr << (settings.hilite ? hilite_keyword : "") << " AS " << (settings.hilite ? hilite_none : "") << backQuoteIfNeed(name);
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}
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void ASTColumnsReplaceTransformer::Replacement::appendColumnName(WriteBuffer & ostr) const
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{
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assert(children.size() == 1);
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children[0]->appendColumnName(ostr);
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writeCString(" AS ", ostr);
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writeProbablyBackQuotedString(name, ostr);
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}
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void ASTColumnsReplaceTransformer::Replacement::updateTreeHashImpl(SipHash & hash_state, bool ignore_aliases) const
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{
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assert(children.size() == 1);
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hash_state.update(name.size());
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hash_state.update(name);
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children[0]->updateTreeHashImpl(hash_state, ignore_aliases);
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IAST::updateTreeHashImpl(hash_state, ignore_aliases);
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}
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void ASTColumnsReplaceTransformer::formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
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{
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settings.ostr << (settings.hilite ? hilite_keyword : "") << "REPLACE" << (is_strict ? " STRICT " : " ") << (settings.hilite ? hilite_none : "");
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if (children.size() > 1)
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settings.ostr << "(";
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for (ASTs::const_iterator it = children.begin(); it != children.end(); ++it)
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{
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if (it != children.begin())
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settings.ostr << ", ";
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(*it)->formatImpl(settings, state, frame);
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}
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if (children.size() > 1)
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settings.ostr << ")";
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}
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void ASTColumnsReplaceTransformer::appendColumnName(WriteBuffer & ostr) const
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{
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writeCString("REPLACE ", ostr);
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if (is_strict)
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writeCString("STRICT ", ostr);
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if (children.size() > 1)
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writeChar('(', ostr);
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for (ASTs::const_iterator it = children.begin(); it != children.end(); ++it)
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{
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if (it != children.begin())
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writeCString(", ", ostr);
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(*it)->appendColumnName(ostr);
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}
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if (children.size() > 1)
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writeChar(')', ostr);
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}
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void ASTColumnsReplaceTransformer::updateTreeHashImpl(SipHash & hash_state, bool ignore_aliases) const
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{
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hash_state.update(is_strict);
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IAST::updateTreeHashImpl(hash_state, ignore_aliases);
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}
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void ASTColumnsReplaceTransformer::replaceChildren(ASTPtr & node, const ASTPtr & replacement, const String & name)
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{
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for (auto & child : node->children)
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{
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if (const auto * id = child->as<ASTIdentifier>())
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{
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if (id->shortName() == name)
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child = replacement->clone();
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}
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else
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replaceChildren(child, replacement, name);
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}
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}
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void ASTColumnsReplaceTransformer::transform(ASTs & nodes) const
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{
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std::map<String, ASTPtr> replace_map;
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for (const auto & replace_child : children)
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{
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auto & replacement = replace_child->as<Replacement &>();
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if (replace_map.find(replacement.name) != replace_map.end())
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Expressions in columns transformer REPLACE should not contain the same replacement more than once");
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replace_map.emplace(replacement.name, replacement.children[0]);
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}
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for (auto & column : nodes)
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{
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if (const auto * id = column->as<ASTIdentifier>())
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{
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auto replace_it = replace_map.find(id->shortName());
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if (replace_it != replace_map.end())
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{
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column = replace_it->second;
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column->setAlias(replace_it->first);
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replace_map.erase(replace_it);
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}
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}
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else if (auto * ast_with_alias = dynamic_cast<ASTWithAlias *>(column.get()))
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{
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auto replace_it = replace_map.find(ast_with_alias->alias);
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if (replace_it != replace_map.end())
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{
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auto new_ast = replace_it->second->clone();
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ast_with_alias->alias = ""; // remove the old alias as it's useless after replace transformation
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replaceChildren(new_ast, column, replace_it->first);
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column = new_ast;
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column->setAlias(replace_it->first);
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replace_map.erase(replace_it);
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}
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}
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}
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if (is_strict && !replace_map.empty())
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{
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String expected_columns;
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for (auto & elem: replace_map)
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{
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if (!expected_columns.empty())
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expected_columns += ", ";
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expected_columns += elem.first;
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}
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throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE, "Columns transformer REPLACE expects following column(s) : {}",
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expected_columns);
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}
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}
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}
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