SES-1896 introduced new ListMemberOperator to represents SPARQL IN
operator. ListMemberOperator is a ValueOperator (in constrast to the In
algebra class, which operates on subqueries).
SES-1896 cleanup
SES-1896 minor fix to make sure ListMemberOperator actually is
recognized by EvaluationStrategyImpl.
SES-1887 : Add regression test for Turtle language tag parsing
SES-1887 : Patch Turtle Parser for language tag parsing
SES-1898 several important fixes in handling of group graph patterns,
optional patterns, and subqueries/exists functions.
SES-1898 cleanup
SES-1898 added two compliance tests for checking LeftJoin semantics,
both greenline.
SES-1896 added parentheses
Merged in ses-1896 (pull request #173)

SES-1896 introduced new ListMemberOperator for more efficient processing of SPARQL IN
Merged in ses-1898 (pull request #175)

SES-1898 several important fixes in handling of group graph patterns, optional patterns, and (not)exists
Merged in SES-1887 (pull request #174)

SES-1887 : Fix regressions with turtle language tag parsing