src/main/java/com/conveyal/gtfs/loader/Table.java
public String generateSelectSql (String namespace, Requirement minimumRequirement) {
        String fieldsString;
        String tableName = String.join(".", namespace, name);
        String fieldPrefix = tableName + ".";
        if (minimumRequirement.equals(EDITOR)) {
            fieldsString = commaSeparatedNames(editorFields(), fieldPrefix, true);
        } else if (minimumRequirement.equals(OPTIONAL)) {
            fieldsString = commaSeparatedNames(specFields(), fieldPrefix, true);
        } else if (minimumRequirement.equals(REQUIRED)) {
            fieldsString = commaSeparatedNames(requiredFields(), fieldPrefix, true);
        } else fieldsString = "*";
        return String.format("select %s from %s", fieldsString, tableName);
    }
public String generateSelectSql (String namespace, Requirement minimumRequirement) {
        String fieldsString;
        String tableName = String.join(".", namespace, name);
        String fieldPrefix = tableName + ".";
        if (minimumRequirement.equals(EDITOR)) {
            fieldsString = commaSeparatedNames(editorFields(), fieldPrefix, true);
        } else if (minimumRequirement.equals(OPTIONAL)) {
            fieldsString = commaSeparatedNames(specFields(), fieldPrefix, true);
        } else if (minimumRequirement.equals(REQUIRED)) {
            fieldsString = commaSeparatedNames(requiredFields(), fieldPrefix, true);
        } else fieldsString = "*";
        return String.format("select %s from %s", fieldsString, tableName);
    }
Generate select all SQL string. The minimum requirement parameter is used to determine which fields ought to be
included in the select statement. For example, if "OPTIONAL" is passed in, both optional and required fields
are included in the select. If "EDITOR" is the minimum requirement, editor, optional, and required fields will
all be included.