public String columnIndexToName(int index) {
        return indexToName(index - 1);
    }
Takes absolute index (starting from 1) and return corresponding column.
Equals to {@code indexToName(index - 1}.

@param index - column index starting from 1
@return - column name.
client-v2/src/main/java/com/clickhouse/client/api/metadata/TableSchema.java