code: public Table createTable(String tableName, String fieldName) {
      // [START ]
      Schema schema = Schema.of(Field.of(fieldName, LegacySQLTypeName.STRING));
      StandardTableDefinition definition =
          StandardTableDefinition.newBuilder()
              .setSchema(schema)
              .setTimePartitioning(TimePartitioning.of(TimePartitioning.Type.DAY))
              .build();
      Table table = dataset.create(tableName, definition);
      // [END ]
      return table;
    }
docs: [VARIABLE “my_field”]