Shuxiong Ye created PHOENIX-2019:
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Summary: Implement Build-in math function ln and log
Key: PHOENIX-2019
URL: https://issues.apache.org/jira/browse/PHOENIX-2019
Project: Phoenix
Issue Type: Sub-task
Reporter: Shuxiong Ye
Implement math build-in function, ln and log. Example show as below:
ln(dp) natural logarithm ln(2.0) 0.693147180559945
log(dp) base 10 logarithm log(100.0) 2
log(b, x) numeric logarithm to base b log(2.0, 64.0) 6.0000000000
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