FILTER keyword for latest anchor queries#146

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rogerlucena wants to merge 34 commits intogoogle:masterfrom

rogerlucena:filter-latest-anchor

Commits on Sep 30, 2020

Add three new triples to the ?test graph of "planner_test.go" (to better test FILTER)
rogerlucena
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Commits on Oct 1, 2020

Add tests for FILTER with latest anchor (in "planner_test.go")
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Commits on Oct 5, 2020

Add tests for FILTER with latest anchor (in "grammar_test.go")
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Add tests for FILTER with latest anchor (in "lexer_test.go")
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Add token type "ItemFilter" to the lexer
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Add token type "ItemFilterFunction" to the lexer
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Add support for FILTER clauses in the grammar
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Add support for FILTER clauses in the lexer
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Add "filters" to the "Statement" type
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Add "filters" to the "queryPlan" type
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Add "workingFilter" to the "Statement" type
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Create FILTER clause hook
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Add String method to FilterClause
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Update String method of queryPlan to show filters as well
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Add FilterOptions to LookupOptions in "storage.go"
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Add support for FILTER clauses in the planner
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Make the volatile driver consume lo.FilterOptions (focusing on latest anchor only for now)
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Update String method of LookupOptions to show FilterOptions as well
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Add tests for FILTER clauses in the semantic.Statement level (in "semantic_test.go")
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Add tests for WhereFilterClauseHook (in "hooks_test.go")
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Minor renaming inside "memory_test.go" to avoid confusion
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Fix problem with partial predicate UUIDs in the volatile driver and make FILTER for latest return multiple triples if they share the same predicate and same latest anchor
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Add tests for the FILTER execution in the volatile driver (in "memory_test.go")
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Allow user to specify for which bindings in the clause each filter can be applied to, improving error checking, and also move verification for supported filter functions to the planner level
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Use a closure to make planner more performant (especially with the addition of multiple filter functions in the future)
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Use an "enum" instead of a "string" for filter operations (less error-prone when implementing the driver)
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Update "memory.go" and "memory_test.go" since filter operations are "enum" now
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Update "hooks_test.go" and "semantic_test.go" since filter operations are "enum" now
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Move "storage.FilteringOptions" to "filter.go" as "filter.StorageOptions"
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Add a String method for filter.StorageOptions
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Use an "enum" instead of a "string" for filter fields (less error-prone when implementing the driver)
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Update "memory.go" and "memory_test.go" since filter fields are "enum" now
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Add an "isEmpty" method for "filter.Operation"
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Update comments for "semantic.FilterClause" and "filter.StorageOptions"
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