Commits on Aug 27, 2016

1. sql: improve the ROUND and EXP functions. …

   Prior to this patch the computation would take too long or too much
   memory if EXP was given an argument too large or if the 2nd ROUND
   argument was negative with a large absolute value.
   
   This patch addresses this issue by limiting the range of acceptable
   arguments (1024 for EXP, anything that causes more than 2000 extra "0"
   digits to be appended on the right for ROUND).
   
   It improves both functions as follows:
   
   - a negative ROUND scale is now supported as in PostgreSQL and Oracle;
     this rounds to positions on the left of the decimal separator.
   
   - the ROUND function for floats is now performed on floats directly,
     instead of using Printf/ParseFloat as previously (faster).
   
   - the ROUND function for decimals is now faster if the 2nd argument is
     negative and its absolute value is larger than the number of digits
     in the 1st argument on the left of its decimal separator.
   
   - ROUND for both floats and decimal now use half to even rounding,
     also called unbiased rounding or bankers' rounding.

   

   knz committed Aug 27, 2016
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