src/main/java/com/conveyal/gtfs/loader/Table.java
public String generateInsertSql (String namespace, boolean setDefaultId) {
        String tableName = namespace == null
                ? name
                : String.join(".", namespace, name);
        String joinedFieldNames = commaSeparatedNames(editorFields());
        String idValue = setDefaultId ? "DEFAULT" : "?";
        return String.format(
            "insert into %s (id, %s) values (%s, %s)",
            tableName,
            joinedFieldNames,
            idValue,
            String.join(", ", Collections.nCopies(editorFields().size(), "?"))
        );
    }
public String generateInsertSql (String namespace, boolean setDefaultId) {
        String tableName = namespace == null
                ? name
                : String.join(".", namespace, name);
        String joinedFieldNames = commaSeparatedNames(editorFields());
        String idValue = setDefaultId ? "DEFAULT" : "?";
        return String.format(
            "insert into %s (id, %s) values (%s, %s)",
            tableName,
            joinedFieldNames,
            idValue,
            String.join(", ", Collections.nCopies(editorFields().size(), "?"))
        );
    }
Create SQL string for use in insert statement. Note, this filters table's fields to only those used in editor.