com.facebook.presto.verifier.checksum.ChecksumValidator Maven / Gradle / Ivy

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.verifier.checksum;

import com.facebook.presto.sql.tree.FunctionCall;
import com.facebook.presto.sql.tree.QualifiedName;
import com.facebook.presto.sql.tree.Query;
import com.facebook.presto.sql.tree.Select;
import com.facebook.presto.sql.tree.SelectItem;
import com.facebook.presto.sql.tree.SingleColumn;
import com.facebook.presto.sql.tree.Table;
import com.facebook.presto.verifier.framework.Column;
import com.facebook.presto.verifier.framework.Column.Category;
import com.google.common.collect.ImmutableList;

import javax.inject.Inject;
import javax.inject.Provider;

import java.util.List;
import java.util.Map;

import static com.facebook.presto.sql.QueryUtil.simpleQuery;
import static com.google.common.collect.ImmutableList.toImmutableList;

public class ChecksumValidator
{
    private final Map> columnValidators;

    @Inject
    public ChecksumValidator(Map> columnValidators)
    {
        this.columnValidators = columnValidators;
    }

    public Query generateChecksumQuery(QualifiedName tableName, List columns)
    {
        ImmutableList.Builder selectItems = ImmutableList.builder();
        selectItems.add(new SingleColumn(new FunctionCall(QualifiedName.of("count"), ImmutableList.of())));
        for (Column column : columns) {
            selectItems.addAll(columnValidators.get(column.getCategory()).get().generateChecksumColumns(column));
        }
        return simpleQuery(new Select(false, selectItems.build()), new Table(tableName));
    }

    public List> getMismatchedColumns(List columns, ChecksumResult controlChecksum, ChecksumResult testChecksum)
    {
        return columns.stream()
                .flatMap(column -> columnValidators.get(column.getCategory()).get().validate(column, controlChecksum, testChecksum).stream())
                .filter(columnMatchResult -> !columnMatchResult.isMatched())
                .collect(toImmutableList());
    }
}