ANALYZE TABLE ... COMPUTE STATISTICS PARTIALSCAN removed
The analyze command collects statistics on tables and partitions, but is slow when scanning many files. A command was added that operated on files in RCfile format to speed up statistics collection. The command was not widely used, not well documented, and evenutally removed.
Before Upgrade to CDP
ANALYZE TABLE ... COMPUTE STATISTICS PARTIALSCAN was added to Hive to collect statistics, not by scanning all content of files, but by scanning only parts to get file metadata. Examples are shown in https://cwiki.apache.org/confluence/display/Hive/RCFileCat.
After Upgrade to CDP
HIVE-17652 removes this syntax in release 3.0.0.
In the unlikely event you used this command, remove it from your code.