Method Next

postgres/parser/sessiondata/search_path.go:227–262

Next returns the next search path, or false if there are no remaining paths.

()

// Next returns the next search path, or false if there are no remaining paths.
func (iter *SearchPathIter) Next() (path string, ok bool) {
	// If the session specific temporary schema has not been created, we can
	// preempt the name resolution failure by simply skipping the implicit pg_temp.
	if iter.implicitPgTempSchema && iter.tempSchemaName != "" {
		iter.implicitPgTempSchema = false
		return iter.tempSchemaName, true
	}
	if iter.implicitPgCatalog {
		iter.implicitPgCatalog = false
		return PgCatalogName, true
	}

	if iter.i < len(iter.paths) {
		iter.i++
		// If pg_temp is explicitly present in the paths, it must be resolved to the
		// session specific temp schema (if one exists). tempSchemaName is set in the
		// iterator iff the session has created a temporary schema.
		if iter.paths[iter.i-1] == PgTempSchemaName {
			// If the session specific temporary schema has not been created we can
			// preempt the resolution failure and iterate to the next entry.
			if iter.tempSchemaName == "" {
				return iter.Next()
			}
			return iter.tempSchemaName, true
		}
		// pg_extension should be read before delving into the schema.
		if iter.paths[iter.i-1] == PublicSchemaName && iter.implicitPgExtension {
			iter.implicitPgExtension = false
			// Go back one so `public` can be found again next.
			iter.i--
			return PgExtensionSchemaName, true
		}
		return iter.paths[iter.i-1], true
	}
	return "", false
}