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Improved comments on the OP_Column changes. Optimize out loading of overflow

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pages for content with zero length.  Add test cases for the latter.

FossilOrigin-Name: 0e05679db7aa302a49e087a81f85203844b98cbe
This commit is contained in:
drh
2013-11-20 20:58:00 +00:00
parent c8606e416a
commit 380d685133
4 changed files with 51 additions and 29 deletions
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18
test/func.test
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@ -1319,6 +1319,24 @@ do_test func-29.6 {
set x
} {1}
# The OP_Column opcode has an optimization that avoids loading content
# for fields with content-length=0 when the content offset is on an overflow
# page. Make sure the optimization works.
#
do_execsql_test func-29.10 {
CREATE TABLE t29b(a,b,c,d,e,f,g,h,i);
INSERT INTO t29b
VALUES(1, hex(randomblob(2000)), null, 0, 1, '', zeroblob(0),'x',x'01');
SELECT typeof(c), typeof(d), typeof(e), typeof(f),
typeof(g), typeof(h), typeof(i) FROM t29b;
} {null integer integer text blob text blob}
do_execsql_test func-29.11 {
SELECT length(f), length(g), length(h), length(i) FROM t29b;
} {0 0 1 1}
do_execsql_test func-29.12 {
SELECT quote(f), quote(g), quote(h), quote(i) FROM t29b;
} {'' X'' 'x' X'01'}
# EVIDENCE-OF: R-29701-50711 The unicode(X) function returns the numeric
# unicode code point corresponding to the first character of the string
# X.