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drizzled/function/str/insert.cc
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  if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
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      args[3]->null_value)
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    goto null; /* purecov: inspected */
 
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    goto null;
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  if ((start < 0) || (start > res->length()))
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    return res;                                 // Wrong param; skip insert
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  /* Re-testing with corrected params */
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  if (start > res->length())
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    return res; /* purecov: inspected */        // Wrong param; skip insert
 
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    return res;
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  if (length > res->length() - start)
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    length= res->length() - start;
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