BindHint will add hints for stmt according to the hints in `hintsSet`.

CheckBindingFromHistoryBindable checks whether the ast and hint string from history is bindable.

CollectHint collects hints for a statement.

ExtractTableHintsFromStmtNode extracts table hints from this node.

GenerateQBName builds QBName from offset.

ParseHintsSet parses a SQL string, then collects and normalizes the HintsSet.

RestoreIndexHint returns string format of IndexHint.

RestoreOptimizerHints restores these hints.

RestoreTableOptimizerHint returns string format of TableOptimizerHint.

TypeDelete for DELETE.

TypeInvalid for unexpected statements.

TypeSelect for SELECT.

TypeUpdate for Update.

BlockHintProcessor processes hints at different level of sql statement.

HintsSet contains all hints of a query.

NodeType indicates if the node is for SELECT / UPDATE / DELETE.