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Use List::size()

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drizzled/sql_yacc.yy
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            /* Use $2 instead of Lex->current_select as derived table will
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               alter value of Lex->current_select. */
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            if (!($3 || $5) && $2->embedding &&
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                !$2->embedding->getNestedJoin()->join_list.elements)
 
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                !$2->embedding->getNestedJoin()->join_list.size())
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            {
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              /* we have a derived table ($3 == NULL) but no alias,
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                 Since we are nested in further parentheses so we
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            }
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            embedding= Lex->current_select->embedding;
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            $$= embedding &&
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                !embedding->getNestedJoin()->join_list.elements;
 
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                !embedding->getNestedJoin()->join_list.size();
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            /* return true if we are deeply nested */
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          }
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        ;