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The following page has been changed by ZhengShao: http://wiki.apache.org/hadoop/Hive/HiveQL/UDF ------------------------------------------------------------------------------ ||A IS NOT NULL||all types||TRUE if expression A evaluates to NULL otherwise FALSE|| ||A LIKE B||strings||TRUE if string A matches the SQL simple regular expression B, otherwise FALSE. The comparison is done character by character. The _ character in B matches any character in A(similar to . in posix regular expressions) while the % character in B matches an arbitrary number of characters in A(similar to .* in posix regular expressions) e.g. 'foobar' like 'foo' evaluates to FALSE where as 'foobar' like 'foo_ _ _' evaluates to TRUE and so does 'foobar' like 'foo%'|| ||A RLIKE B||strings||TRUE if string A matches the Java regular expression B(See Java regular expressions syntax), otherwise FALSE e.g. 'foobar' rlike 'foo' evaluates to FALSE where as 'foobar' rlike '^f.*r$' evaluates to TRUE|| - ||A REGEXP B||strings||Same as RLIKE|| + ||A REGEXP B||strings||Same as RLIKE|| === Arithmetic Operators ===
