[Hadoop Wiki] Update of "Hive/Tutorial" by VijendarGanta

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The following page has been changed by VijendarGanta:
http://wiki.apache.org/hadoop/Hive/Tutorial

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  || A IS NULL || all types || TRUE if expression A evaluates to NULL otherwise FALSE||
  || 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%'||
+ || NOT A LIKE B || strings || TRUE if string A matches the SQL simple regular expression B, otherwise FALSE||
  || A RLIKE B || strings ||  TRUE if string A matches the Java regular expression B(See [http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html 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 ||