GroupOptionNilSortLo configures nil values to be sorted lower than any other value.

IsLastDescendingAggregateOptimization checks two things: If the request passed in is using the `last` aggregate type, and if it doesn't have a window.

IsLastDescendingGroupOptimization checks if this request is using the `last` aggregate type.

TODO(jsternberg): The range is [start, end) for this function which is consistent with the documented interface for datatypes.ReadFilterRequest.

NodeToExpr transforms a predicate node to an influxql.Expr.

ResultSetToLineProtocol transforms rs to line protocol and writes the output to wr.

WindowStart calculates the start time of a window given a timestamp, the window period (every), and the offset starting from the epoch.

WindowStop calculates the stop time of a window given a timestamp, the window period (every), and the offset starting from the epoch.

MaxPointsPerBlock is the maximum number of points in an encoded block in a TSM file.

nil sorts highest.

nil sorts lowest.

tagsKeyMerger is responsible for determining a merged set of tag keys.

NodeVisitor can be called by Walk to traverse the Node hierarchy.

Valuer is the interface that wraps the Value() method.