**Use case**
mysql repl to clickhouse

**Describe the solution you'd like**
Hope MaterializeMySQL engine can support MySQL prefix index



ASTExpressionList * columns_define, ASTExpressionList * indices_define, const Context & context, NamesAndTypesList & columns)
{
    NameSet increment_columns;
    auto keys = makeASTFunction("tuple");
    auto unique_keys = makeASTFunction("tuple");
    auto primary_keys = makeASTFunction("tuple");
    if (indices_define && !indices_define->children.empty())
    {
        for (const auto & declare_index_ast : indices_define->children)
        {
            const auto & declare_index = declare_index_ast->as<MySQLParser::ASTDeclareIndex>();
            
            if (startsWith(declare_index->index_type, "KEY_"))
                keys->arguments->children.insert(keys->arguments->children.end(),