[IMPALA-4922] Error msg for bogus Kudu ENCODING attribute refers to nonexistent attribute values

• Type: Improvement
• Status: Reopened
• Priority: Trivial
• Resolution: Unresolved
• Affects Version/s: Impala 2.8.0
• Component/s: Frontend
• Labels: kudu
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: John Russell
• Created: 13/Feb/17 20:04
• Updated: 17/Aug/17 17:56

Description

If you attempt to create a Kudu table with a bogus value for the ENCODING attribute, the error message gives a list of attribute values that are supposed to be recognized:

create table xyz (x int primary key encoding foo) stored as kudu;
ERROR: AnalysisException: Unsupported encoding value 'FOO'. Supported encoding values are: UNKNOWN, AUTO_ENCODING, PLAIN_ENCODING, PREFIX_ENCODING, GROUP_VARINT, RLE, DICT_ENCODING, BIT_SHUFFLE

However, several of these suggested values are not recognized or otherwise don't work:

create table xyz (x int primary key encoding unknown) partition by hash (x) partitions 2 stored as kudu;
ERROR: IllegalStateException: Error parsing encoding/compression values for Kudu column 'x': Unsupported encoding: UNKNOWN

create table xyz (x int primary key encoding group_varint) partition by hash (x) partitions 2 stored as kudu;
ERROR: 
ImpalaRuntimeException: Error creating Kudu table 'impala::jrussell.xyz'
CAUSED BY: NonRecoverableException: invalid encoding for column 'x': encoding GROUP_VARINT not supported for type INT32

The spec of GROUP_VARINT in Kudu sounds like it should apply to all sizes of integers. I tried TINYINT, SMALLINT, INT, and BIGINT but Impala didn't recognize GROUP_VARINT encoding for any of those types.

Let's make the error message only refer to choices that are actually available.