NewContext creates a Context.

NewNodeW creates a NodeW.

NewNodeWWithCtx creates a NodeW with the given Context.

Context is used to store the context and result of resolving AST tree.

NodeW is a wrapper around ast.Node to store resolve context.

ResultField represents a result field which can be a column from a table, or an expression in select field.

TableNameW is a wrapper around ast.TableName to store more information.