Add support for TRIM function, works also for LTRIM and RTRIM
Add test cases for TRIM, LTRIM, RTRIM
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3233-stringfunc
Fixes according to Paul's suggestion
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3233-stringfunc
Add support for string REPLACE function
Merge pull request #1287 from VoltDB/string-func-xin

Add support for string REPLACE function
Checkpoint for SQL OVERLAY funcition and NValue optimization
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3233-stringfunc
Fix the to_string function that does not exist in our std library
fix the demcimal multiple type problem
Fix the missing Decimal null check
Fix the cast from Double type and add test cases for OVERLAY
Optimize the way to return NULL value
Three argument function OVERLAY
OVERLAY does not work for UTF8 string
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3233-stringfunc
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3233-stringfunc
Start to support utf8 string for overlay string function
Add CHAR function and change negative argument behavior