Quanlong Huang created IMPALA-10319:
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Summary: Support arbitrary encodings on text files
Key: IMPALA-10319
URL: https://issues.apache.org/jira/browse/IMPALA-10319
Project: IMPALA
Issue Type: New Feature
Reporter: Quanlong Huang
Attachments: gbk_names.txt
ORC/Parquet/Avro files store strings in UTF-8 encoded bytes. However, text
files can be in arbitrary encodings. Hive support specifying arbitrary encoding
on text tables in the "serialization.encoding" table property (HIVE-7142).
Impala is currently not aware of this table property and treate all strings as
byte arrays. It's good to support at least reading from these text files.
*Example*
Create a text table in Hive using GBK encoding and load a GBK encoded text file
into it:
{code:sql}
hive> create table gbk_names (name string) stored as textfile
tblproperties("serialization.encoding"="GBK");
hive> load data local inpath '/home/quanlong/workspace/Impala/gbk_names.txt'
into table gbk_names;
hive> select * from gbk_names;
+-----------------+
| gbk_names.name |
+-----------------+
| 张三 |
| 李四 |
| 王五 |
+-----------------+
{code}
Impala read strings as byte arrays so can't decode them correctly:
{code:sql}
impala-shell> invalidate metadata gbk_names;
impala-shell> select * from gbk_names;
+------+
| name |
+------+
| ���� |
| ���� |
| ���� |
+------+
{code}
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