Examples with RowSignature org.apache.druid.segment.column.RowSignature used on opensource projects

Example 46 with RowSignature

use of org.apache.druid.segment.column.RowSignature in project druid by druid-io.

the class RowSignatures method fromRelDataType.

public static RowSignature fromRelDataType(final List<String> rowOrder, final RelDataType rowType) {
    if (rowOrder.size() != rowType.getFieldCount()) {
        throw new IAE("Field count %d != %d", rowOrder.size(), rowType.getFieldCount());
    }
    final RowSignature.Builder rowSignatureBuilder = RowSignature.builder();
    for (int i = 0; i < rowOrder.size(); i++) {
        final RelDataType dataType = rowType.getFieldList().get(i).getType();
        final ColumnType valueType = Calcites.getColumnTypeForRelDataType(dataType);
        rowSignatureBuilder.add(rowOrder.get(i), valueType);
    }
    return rowSignatureBuilder.build();
}