public String getFieldTypeName(int fieldOrdinal) { RelDataType type = getFieldNamedType(fieldOrdinal); SqlTypeName typeName = type.getSqlTypeName(); if (typeName == null) { return type.toString(); } switch (typeName) { case STRUCTURED: case DISTINCT: return type.getSqlIdentifier().toString(); case INTERVAL_DAY_TIME: case INTERVAL_YEAR_MONTH: return type.toString(); } return typeName.name(); }