Examples with ResultSet com.google.spanner.v1.ResultSet used on opensource projects

Example 76 with ResultSet

use of com.google.spanner.v1.ResultSet in project googleads-java-lib by googleads.

the class Pql method combineResultSets.

/**
 * Combines the first and second result sets, if and only if, the columns of both result sets
 * match.
 *
 * @throws IllegalArgumentException if the columns of the first result set don't match the second
 */
public static ResultSet combineResultSets(ResultSet first, ResultSet second) {
    Function<ColumnType, String> columnTypeToString = new Function<ColumnType, String>() {

        @Override
        public String apply(ColumnType input) {
            return input.getLabelName();
        }
    };
    List<String> firstColumns = Lists.transform(Lists.newArrayList(first.getColumnTypes()), columnTypeToString);
    List<String> secondColumns = Lists.transform(Lists.newArrayList(second.getColumnTypes()), columnTypeToString);
    if (!firstColumns.equals(secondColumns)) {
        throw new IllegalArgumentException(String.format("First result set columns [%s] do not match second columns [%s]", Joiner.on(",").join(firstColumns), Joiner.on(",").join(secondColumns)));
    }
    List<Row> combinedRows = Lists.newArrayList(first.getRows());
    if (second.getRows() != null) {
        Collections.addAll(combinedRows, second.getRows());
    }
    ResultSet combinedResultSet = new ResultSet();
    combinedResultSet.setColumnTypes(first.getColumnTypes());
    combinedResultSet.setRows(combinedRows.toArray(new Row[] {}));
    return combinedResultSet;
}