Rust: Fix bad joins

[hvitved]

Evaluated relational algebra for predicate _Synth::Synth::TFormatArgument#5cbf2ffd_63#join_rhs__Format::Format.getArgumentRef/0#dispred#38d664c__#antijoin_rhs@889ee4br with tuple counts:
           11356  ~0%    {5} r1 = JOIN `_Format::Format.getArgumentRef/0#dispred#38d664cb_Format::Format.getParent/0#dispred#f6ec3e8b_10#joi__#shared` WITH Synth::Synth::TFormatArgument#5cbf2ffd_63#join_rhs ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2, Lhs.3, Lhs.0
        19631351  ~0%    {6}    | JOIN WITH name_texts_10#join_rhs ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2, Lhs.3, Lhs.4, Lhs.0
           45933  ~0%    {6}    | JOIN WITH format_args_arg_names_10#join_rhs ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.2, Lhs.3, Lhs.4, Lhs.5
             747  ~0%    {5}    | JOIN WITH format_args_expr_args_02#join_rhs ON FIRST 2 OUTPUT Lhs.0, Lhs.2, Lhs.3, Lhs.4, Lhs.5
                         return r1

Evaluated relational algebra for predicate __Format::Format.getParent/0#dispred#f6ec3e8b_FormatArgument::FormatArgument.getParent/0#dispred#864__#antijoin_rhs@01d9d70k with tuple counts:
        19631351  ~1%    {6} r1 = JOIN `_Format::Format.getParent/0#dispred#f6ec3e8b_FormatArgument::FormatArgument.getParent/0#dispred#8641__#shared` WITH name_texts_10#join_rhs ON FIRST 1 OUTPUT Lhs.4, Lhs.0, Lhs.1, Lhs.2, Lhs.3, Rhs.1
         5173010  ~0%    {7}    | JOIN WITH format_args_expr_args ON FIRST 1 OUTPUT Rhs.2, Lhs.5, Lhs.1, Lhs.2, Lhs.3, Lhs.4, Lhs.0
             747  ~0%    {5}    | JOIN WITH format_args_arg_names ON FIRST 2 OUTPUT Lhs.2, Lhs.3, Lhs.4, Lhs.5, Lhs.6
                         return r1

Evaluated relational algebra for predicate _NamedFormatArgument::NamedFormatArgument#18940f8e__Format::Format.getParent/0#dispred#f6ec3e8b_10#j__#antijoin_rhs@dafbd6hr with tuple counts:
           11356  ~0%    {5} r1 = JOIN `_Format::Format.getParent/0#dispred#f6ec3e8b_10#join_rhs_FormatArgument::FormatArgument.getParent/0#__#shared` WITH NamedFormatArgument::NamedFormatArgument#18940f8e ON FIRST 1 OUTPUT Rhs.4, Lhs.1, Lhs.2, Lhs.3, Lhs.0
        19631351  ~0%    {6}    | JOIN WITH name_texts_10#join_rhs ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2, Lhs.3, Lhs.4, Lhs.0
           45933  ~0%    {6}    | JOIN WITH format_args_arg_names_10#join_rhs ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.2, Lhs.3, Lhs.4, Lhs.5
             747  ~0%    {5}    | JOIN WITH format_args_expr_args_02#join_rhs ON FIRST 2 OUTPUT Lhs.0, Lhs.2, Lhs.3, Lhs.4, Lhs.5
                         return r1

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