Implement CQL Substring Operator #129
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This commit introduces the implementation for the CQL Substring operator. * Initial jules implementation * Correctly support startIndex=stringLen case, correct tests * Refactor for readability Author: Suyash Kumar <suyashkumar2003@gmail.com>
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This implements the CQL Substring operator.
One interesting note: what should Substring('', 0) produce? The current code returns an empty string instead of Null (it seems reasonable to get the identical string when doing Substring(str, 0) == str to me). The spec would probably imply Null. Could be worth clarifying/discussing, happy to change that back.