io.trino.sql.planner.plan.RowsPerMatch Maven / Gradle / Ivy
/*
* 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 io.trino.sql.planner.plan;
public enum RowsPerMatch
{
ONE {
@Override
public boolean isOneRow()
{
return true;
}
@Override
public boolean isEmptyMatches()
{
return true;
}
@Override
public boolean isUnmatchedRows()
{
return false;
}
},
// ALL_SHOW_EMPTY option applies to the MATCH_RECOGNIZE clause.
// Output all rows of every match, including empty matches.
// In the case of an empty match, output the starting row of the match attempt.
// Do not produce output for the rows matched within exclusion `{- ... -}`.
ALL_SHOW_EMPTY {
@Override
public boolean isOneRow()
{
return false;
}
@Override
public boolean isEmptyMatches()
{
return true;
}
@Override
public boolean isUnmatchedRows()
{
return false;
}
},
// ALL_OMIT_EMPTY option applies to the MATCH_RECOGNIZE clause.
// Output all rows of every non-empty match.
// Do not produce output for the rows matched within exclusion `{- ... -}`
ALL_OMIT_EMPTY {
@Override
public boolean isOneRow()
{
return false;
}
@Override
public boolean isEmptyMatches()
{
return false;
}
@Override
public boolean isUnmatchedRows()
{
return false;
}
},
// ALL_WITH_UNMATCHED option applies to the MATCH_RECOGNIZE clause.
// Output all rows of every match, including empty matches.
// Produce an additional output row for every unmatched row.
// Pattern exclusions are not allowed with this option.
ALL_WITH_UNMATCHED {
@Override
public boolean isOneRow()
{
return false;
}
@Override
public boolean isEmptyMatches()
{
return true;
}
@Override
public boolean isUnmatchedRows()
{
return true;
}
},
// WINDOW option applies to pattern recognition within window specification.
// Output one row for every input row:
// - if the row is skipped by some previous match, produce output as for unmatched row
// - if match is found (either empty or non-empty), output a single-row summary
// - if no match is found, produce output as for unmatched row
WINDOW {
@Override
public boolean isOneRow()
{
return true;
}
@Override
public boolean isEmptyMatches()
{
return true;
}
@Override
public boolean isUnmatchedRows()
{
return true;
}
};
public abstract boolean isOneRow();
public abstract boolean isEmptyMatches();
public abstract boolean isUnmatchedRows();
}