IMPALA-10319: Support arbitrary encodings on Text files

As proposed in Jira, this implements decoding and encoding of text
buffers for Impala/Hive text tables. Given a table with
'serialization.encoding' property set, similarly to Hive, Impala should
be able to encode the inserted data into charset specified, consequently
saving it into a text file. The opposite decoding operation should be
performed upon reading data buffers from text files. Both operations
employ boost::locale::conv library.

Since Hive doesn't encode line delimiters, charsets that would have
delimiters stored differently from ASCII are not allowed.

One difference from Hive is that Impala implements
'serialization.encoding' only as a per partition serdeproperty to avoid
confusion of allowing both serde and tbl properties. (See related
IMPALA-13748)

Note: Due to precreated non-UTF-8 files present in the patch
'gerrit-code-review-checks' was performed locally. (See IMPALA-14100)

Change-Id: I787cd01caa52a19d6645519a6cedabe0a5253a65
Reviewed-on: http://gerrit.cloudera.org:8080/22049
Reviewed-by: Csaba Ringhofer <csringhofer@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

common/thrift/CatalogObjects.thrift

@@ -365,6 +365,7 @@ struct THdfsStorageDescriptor {
   7: required THdfsFileFormat fileFormat
   8: required i32 blockSize
   9: optional TJsonBinaryFormat jsonBinaryFormat
+  10: optional string encodingValue
 }
 
 // Represents an HDFS partition

common/thrift/generate_error_codes.py

@@ -500,7 +500,9 @@ error_codes = (
    "cache entry ($0 bytes)"),
 
   ("TUPLE_CACHE_OUTSTANDING_WRITE_LIMIT_EXCEEDED", 163, "Outstanding tuple cache writes "
-   "exceeded the limit ($0 bytes)")
+   "exceeded the limit ($0 bytes)"),
+
+  ("CHARSET_CONVERSION_ERROR", 164, "Error during buffer conversion: $0")
 )
 
 import sys