nirvn 0fbcc4b95d [FEATURE] upgrade the substr() function
- support negative start value (e.g. substr('hello',-2) returns 'lo')
- support negative length value (e.g. substr('hello',3,-1) returns 'll')
- length parameter now optional, defaults to end of string
  (e.g. substr('hello world',7) returns 'world')
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if
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iqr
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q1
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q3
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sum
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x
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y
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