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107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
#include <DataStreams/ExpressionBlockInputStream.h>
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#include <DataStreams/CheckConstraintsBlockOutputStream.h>
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#include <Parsers/formatAST.h>
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#include <Columns/ColumnsCommon.h>
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#include <Common/assert_cast.h>
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#include <Common/FieldVisitors.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 VIOLATED_CONSTRAINT;
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}
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CheckConstraintsBlockOutputStream::CheckConstraintsBlockOutputStream(
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const String & table_,
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const BlockOutputStreamPtr & output_,
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const Block & header_,
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const ConstraintsDescription & constraints_,
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const Context & context_)
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: table(table_),
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output(output_),
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header(header_),
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constraints(constraints_),
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expressions(constraints_.getExpressions(context_, header.getNamesAndTypesList()))
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{
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}
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void CheckConstraintsBlockOutputStream::write(const Block & block)
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{
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if (block.rows() > 0)
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{
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Block block_to_calculate = block;
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for (size_t i = 0; i < expressions.size(); ++i)
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{
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auto constraint_expr = expressions[i];
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constraint_expr->execute(block_to_calculate);
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ColumnWithTypeAndName res_column = block_to_calculate.getByPosition(block_to_calculate.columns() - 1);
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const ColumnUInt8 & res_column_uint8 = assert_cast<const ColumnUInt8 &>(*res_column.column);
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const UInt8 * data = res_column_uint8.getData().data();
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size_t size = res_column_uint8.size();
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/// Is violated.
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if (!memoryIsByte(data, size, 1))
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{
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size_t row_idx = 0;
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for (; row_idx < size; ++row_idx)
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{
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std::cerr << row_idx << ": " << int(data[row_idx]) << "\n";
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if (data[row_idx] != 1)
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break;
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}
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Names related_columns = constraint_expr->getRequiredColumns();
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std::stringstream exception_message;
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exception_message << "Constraint " << backQuote(constraints.constraints[i]->name)
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<< " for table " << backQuote(table)
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<< " is violated at row " << (rows_written + row_idx + 1)
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<< ". Expression: (" << serializeAST(*(constraints.constraints[i]->expr), true) << ")"
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<< ". Column values";
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bool first = true;
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for (const auto & name : related_columns)
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{
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const IColumn & column = *block.getByName(name).column;
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assert(row_idx < column.size());
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exception_message << (first ? ": " : ", ")
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<< backQuoteIfNeed(name) << " = " << applyVisitor(FieldVisitorToString(), column[row_idx]);
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first = false;
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}
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throw Exception{exception_message.str(), ErrorCodes::VIOLATED_CONSTRAINT};
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}
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}
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}
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output->write(block);
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rows_written += block.rows();
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}
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void CheckConstraintsBlockOutputStream::flush()
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{
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output->flush();
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}
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void CheckConstraintsBlockOutputStream::writePrefix()
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{
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output->writePrefix();
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}
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void CheckConstraintsBlockOutputStream::writeSuffix()
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{
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output->writeSuffix();
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}
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}
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