core/src/main/java/com/datastax/oss/driver/internal/core/metadata/schema/parsing/TableParser.java [299:315]:
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  private static String buildLegacyIndexTarget(ColumnMetadata column, Map<String, String> options) {
    String columnName = column.getName().asCql(true);
    DataType columnType = column.getType();
    if (options.containsKey("index_keys")) {
      return String.format("keys(%s)", columnName);
    }
    if (options.containsKey("index_keys_and_values")) {
      return String.format("entries(%s)", columnName);
    }
    if ((columnType instanceof ListType && ((ListType) columnType).isFrozen())
        || (columnType instanceof SetType && ((SetType) columnType).isFrozen())
        || (columnType instanceof MapType && ((MapType) columnType).isFrozen())) {
      return String.format("full(%s)", columnName);
    }
    // Note: the keyword 'values' is not accepted as a valid index target function until 3.0
    return columnName;
  }
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core/src/main/java/com/datastax/dse/driver/internal/core/metadata/schema/parsing/DseTableParser.java [319:335]:
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  private static String buildLegacyIndexTarget(ColumnMetadata column, Map<String, String> options) {
    String columnName = column.getName().asCql(true);
    DataType columnType = column.getType();
    if (options.containsKey("index_keys")) {
      return String.format("keys(%s)", columnName);
    }
    if (options.containsKey("index_keys_and_values")) {
      return String.format("entries(%s)", columnName);
    }
    if ((columnType instanceof ListType && ((ListType) columnType).isFrozen())
        || (columnType instanceof SetType && ((SetType) columnType).isFrozen())
        || (columnType instanceof MapType && ((MapType) columnType).isFrozen())) {
      return String.format("full(%s)", columnName);
    }
    // Note: the keyword 'values' is not accepted as a valid index target function until 3.0
    return columnName;
  }
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