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Re: [xsl] Efficient way to check sequence membership
Subject: Re: [xsl] Efficient way to check sequence membership From: ht@xxxxxxxxxxxx (Henry S. Thompson) Date: Wed, 02 Mar 2011 23:10:44 +0000 |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 David Carlisle writes: > personally I'd just use <xsl:sequence select="$s=$stops"/> > and leave it to the query optimiser to make this common requirement > efficient rather than using a more complicated idiom and then hoping > the query optimiser recognises it. That is only 1ms faster on average that the "some $s . . ." alternative, i.e. still more than a factor of 4 slower than the fastest version. I'll try Dimitri's binary version tomorrow. . . ht - -- Henry S. Thompson, School of Informatics, University of Edinburgh 10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 651-1426, e-mail: ht@xxxxxxxxxxxx URL: http://www.ltg.ed.ac.uk/~ht/ [mail from me _always_ has a .sig like this -- mail without it is forged spam] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFNbs53kjnJixAXWBoRAssNAJ9ThvXiZShnuYUlBo8Po3bCGgh6NgCdGI2K V5ZvumgvesqS9XAcudXkcIo= =q0UI -----END PGP SIGNATURE-----
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