[CASSANDRA-11434] Support EQ/PREFIX queries in CONTAINS mode without tokenization by augmenting SA metadata per term

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 3.6
• Component/s: Feature/SASI
• Assignee: Jordan West
• Reporter: Pavel Yaskevich

Authors

Jordan West

Reviewers

Pavel Yaskevich

• Created: 25/Mar/16 09:04
• Updated: 16/Apr/19 09:30
• Resolved: 03/Apr/16 07:29

Description

We can support EQ/PREFIX requests to CONTAINS indexes by tracking "partiality" of the data stored in the OnDiskIndex and IndexMemtable, if we know exactly if current match represents part of the term or it's original form it would be trivial to support EQ/PREFIX since PREFIX is subset of SUFFIX matches.

Since we attach uint16 size to each term stored we can take advantage of sign bit so size of the index is not impacted at all.