Update of /cvsroot/monetdb/pathfinder/compiler/semantics
In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv2829/compiler/semantics
Modified Files:
Tag: Nov2009
xquery_fo.c
Log Message:
propagated changes of Monday Sep 28 2009 - Wednesday Oct 07 2009
from the Aug2009_NFI branch to the Nov2009 branch
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2009/09/28 - boncz: compiler/semantics/xquery_fo.c,1.186.6.1
optimizations for NFI XIRAF use case -- thanks a great bunch Jan R.!!
- ds_link (already in Stable) optimized for 1-node case
- indices now contain all data (but still not used automatically, nor based
on Lefteris' new indexing schemes)
most prominently though is: subexpression result caching
- caching hints in pragmas
- query enclosed in (# pf:session id:msec ) { query } or (# pf:session-use
id:msec ) { query }
+ queries in the same session use the same working set (documents opened
only once)
+ same working set allows to cache results
+ pf:session-use only uses cache, cannot add to it
- but, multiple pf:session-use can run concurrently; whereas pf:session
is exclusive
- inside a query, an arbitrary number of expressions can be marked up for
caching/reuse
+ (# pf:cache id ) { subexpr }
+ subexpr may not be enclosed by a for-loop
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2009/10/06 - boncz: compiler/semantics/xquery_fo.c,1.186.6.2
enable heuristic rewrite value-selections in the algebra backend of
MonetDB/xQuery
has to properly implement pf:attribute(ctx, node, ns1, loc1, ns2, loc2) first,
as only the verion without namespaces was there (that one is now gone).
many restrictions:
- only non-loop-lifted equality tests
- not involving fn:collection or pf:collection (as path reversal in the
latter will never find the supernode)
- not involving any date/time/etc typed expressions (as the indices only work
for string and numerical equality)
went through the testweb and fixed all apparant problems
note the Aug2009_NFI value indices are full; whereas previously they would
omit frequent data items
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
U xquery_fo.c
Index: xquery_fo.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/semantics/xquery_fo.c,v
retrieving revision 1.186
retrieving revision 1.186.4.1
diff -u -d -r1.186 -r1.186.4.1
--- xquery_fo.c 20 Jun 2009 09:36:36 -0000 1.186
+++ xquery_fo.c 7 Oct 2009 13:48:18 -0000 1.186.4.1
@@ -2351,6 +2351,12 @@
.ret_ty = PFty_xs_boolean () } },
.alg = PFbui_op_and_bln }
+ , /* #pf:query-cache (str, item *) as item* */
+ { .ns = PFns_pf, .loc = "query-cache",
+ .arity = 2, .sig_count = 1, .sigs = { {
+ .par_ty = (PFty_t[]) { PFty_xs_string (), PFty_star (PFty_item ())
},
+ .ret_ty = PFty_star (PFty_item ()) } },
+ .alg = PFbui_pf_query_cache }
, /* #pf:distinct-doc-order-or-atomic-sequence (item*) as item* */
{ .ns = PFns_pf, .loc = "distinct-doc-order-or-atomic-sequence",
.arity = 1, .sig_count = 1, .sigs = { {
@@ -2551,13 +2557,6 @@
.par_ty = (PFty_t[]) { PFty_star (PFty_xs_anyNode ()) },
.ret_ty = PFty_star (PFty_xs_anyNode ()) } },
.alg = PFbui_pf_fragment }
- , /* pf:attribute (node()*, string) as node()* */
- { .ns = PFns_lib, .loc = "attribute",
- .arity = 2, .sig_count = 1, .sigs = { {
- .par_ty = (PFty_t[]) { PFty_star( PFty_xs_anyNode ()),
- PFty_xs_string () },
- .ret_ty = PFty_star( PFty_xs_anyNode ()) } },
- .alg = PFbui_pf_attribute }
, /* pf:attribute (node()*, string, string, string, string, string) as
node()* */
{ .ns = PFns_lib, .loc = "attribute",
.arity = 6, .sig_count = 1, .sigs = { {
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