add RLE as encoding type

python/pyarrow/parquet/core.py

@@ -771,7 +771,8 @@ def _sanitize_table(table, new_schema, flavor):
     Specify if we should use dictionary encoding in general or only for
     some columns.
     When encoding the column, if the dictionary size is too large, the
-    column will fallback to 'PLAIN' encoding.
+    column will fallback to fallback encoding. Specially, ``BOOLEAN`` type
+    doesn't support dictionary encoding.
 compression : str or dict, default 'snappy'
     Specify the compression codec, either on a general basis or per-column.
     Valid values: {'NONE', 'SNAPPY', 'GZIP', 'BROTLI', 'LZ4', 'ZSTD'}.
@@ -823,10 +824,11 @@ def _sanitize_table(table, new_schema, flavor):
     and should be combined with a compression codec.
 column_encoding : string or dict, default None
     Specify the encoding scheme on a per column basis.
-    Can only be used when when ``use_dictionary`` is set to False, and cannot
-    be used in combination with ``use_byte_stream_split``.
+    Can only be used when when ``use_dictionary`` is set to False, and
+    cannot be used in combination with ``use_byte_stream_split``.
     Currently supported values: {'PLAIN', 'BYTE_STREAM_SPLIT',
-    'DELTA_BINARY_PACKED', 'DELTA_LENGTH_BYTE_ARRAY', 'DELTA_BYTE_ARRAY'}.
+    'DELTA_BINARY_PACKED', 'DELTA_LENGTH_BYTE_ARRAY', 'DELTA_BYTE_ARRAY',
+    'RLE}.
     Certain encodings are only compatible with certain data types.
     Please refer to the encodings section of `Reading and writing Parquet
     files <https://arrow.apache.org/docs/cpp/parquet.html#encodings>`_.