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Posted to issues-all@impala.apache.org by "Greg Rahn (JIRA)" <ji...@apache.org> on 2018/10/25 20:42:00 UTC
[jira] [Created] (IMPALA-7759) Add Levenshtein edit distance
function
Greg Rahn created IMPALA-7759:
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Summary: Add Levenshtein edit distance function
Key: IMPALA-7759
URL: https://issues.apache.org/jira/browse/IMPALA-7759
Project: IMPALA
Issue Type: New Feature
Reporter: Greg Rahn
Assignee: Greg Rahn
References:
* [Netezza - (le_dst())|https://www.ibm.com/support/knowledgecenter/en/SSULQD_7.2.1/com.ibm.nz.dbu.doc/r_dbuser_functions_expressions_fuzzy_funcs.html]
* [Postgres - levenshtein()|https://www.postgresql.org/docs/current/static/fuzzystrmatch.html#id-1.11.7.24.6]
One notable difference:
* Netezza: if either value is NULL, returns the length of non-NULL value
* Postgres: if either value is NULL, returns NULL
Preference is to implement Postgres version due to ease of cross-system testing.
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