Small performance and size optimization to allocateCursor().

FossilOrigin-Name: 23f042669aff535afa6ee9de367656848d01e90a1c9dab9359fa938a615b4195

Minor changes to make it easier for static analyzers to reason about the code.

FossilOrigin-Name: ba4104aa02625b51113978c1bb540b75bd88cb1959c7e9bfb4113db4159df5d4

Fix the memdb VFS so that it does not allow mmap if it is resizable, and so
that it never opens a disk file for any reason.

FossilOrigin-Name: 5ee14715a561d7522e9c6fd35a2ad3e6de526450025a99d2a523c2b

Fix the memdb VFS so that it does not allow mmap if it is resizable, and so
that it never opens a disk file for any reason.

FossilOrigin-Name: 5ee14715a561d7522e9c6fd35a2ad3e6de526450025a99d2a523c2b27151be4f

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Add NULL checks on all sqlite3_vfs_find(0) calls. This is not strictly
necessary. There are no vulnerabilities here. However, adding these
checks avoids unnecessary static analyzer complaints.
[fo

Add NULL checks on all sqlite3_vfs_find(0) calls. This is not strictly
necessary. There are no vulnerabilities here. However, adding these
checks avoids unnecessary static analyzer complaints.
[forum:/forumpost/ce1193be15|Forum post ce1193be15].

FossilOrigin-Name: 272a15b9f418fb0b31a9808f7c42c20cf52318035ff98935d8e8519634357e8d

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Fix another (harmless in practice) tsan error in shared-cache mode.

FossilOrigin-Name: 5a74fa3f0a64f462c8add9beae231a9bbdd19e54d07b54f08726cb1411fc8d3a

Faster decoding of 32-bit variable-length integers in cases were we do not
need to know the number of bytes in the encoding.

FossilOrigin-Name: 59a31b16b54a0068c81ee65bc2fa905c2c826e98da3a7ffd8c3ea8

Faster decoding of 32-bit variable-length integers in cases were we do not
need to know the number of bytes in the encoding.

FossilOrigin-Name: 59a31b16b54a0068c81ee65bc2fa905c2c826e98da3a7ffd8c3ea860a2827b4a

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Omit a pointless memory allocation in vdbeSorterSort().

FossilOrigin-Name: 5d76dbc5b0584c15d7d59e5c079868f2077f32b865f406b40ec837b8ab6ef2e1

Experimental implementation of NULLS FIRST/LAST. This branch still has problems - the most significant of which is that ORDER BY clauses with a non-default NULLS FIRST/LAST qualifier can never use an

Experimental implementation of NULLS FIRST/LAST. This branch still has problems - the most significant of which is that ORDER BY clauses with a non-default NULLS FIRST/LAST qualifier can never use an index.

FossilOrigin-Name: 07babb0f897fc8c9cb5b30481899c32fdd743f3f3ca508d8d957826252107dd5

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Add new assert() statements in an attempt to help static analyzers avoid
false-positives.

FossilOrigin-Name: 9e66458592d40fbd96ea5f21339573110ca1cfe328238a020c9420a87d35dd72

Avoid a sanitizer error (pointer arithmatic overflow) in vdbesort.c.

FossilOrigin-Name: af61a2fc45a0fa1277d7453779238b77de4c298a9f60714b7dc62ddca5874f80

Enforce the SQLITE_LIMIT_COLUMN limit on virtual tables.

FossilOrigin-Name: 0b6ae032c28e7fe34d81d1769f6e2901addbd1b95cd9a255dcef274061fb0164

Further attempts to reduce the number of false-positives genenerated by
static analysis tools.

FossilOrigin-Name: 38f9ce6503c4dd05ccdd73463b1784a6df7ed6e5018c29c5874a3681ca34ba54

Remove the rarely-used scratch memory allocator. This makes the code smaller,
faster, and easier to maintain. In place of the scratch allocator, add the
SQLITE_CONFIG_SMALL_MALLOC configuration opt

Remove the rarely-used scratch memory allocator. This makes the code smaller,
faster, and easier to maintain. In place of the scratch allocator, add the
SQLITE_CONFIG_SMALL_MALLOC configuration option that provides a hint to SQLite
that large memory allocations should be avoided.

FossilOrigin-Name: 54b000246cfb5c7b8adb61a17357ef5a49adddde9e48e8937834d5ba0beb8a6b

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In the KeyInfo object, refactor the nField and nXField elements into
nKeyField and nAllField, which are more useful and run a little faster.

FossilOrigin-Name: aea5990eab5e85f92df966aa641db2271c8105

In the KeyInfo object, refactor the nField and nXField elements into
nKeyField and nAllField, which are more useful and run a little faster.

FossilOrigin-Name: aea5990eab5e85f92df966aa641db2271c81052010ad2d80982475c4275a1284

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Change sqlite3BtreeNext() and sqlite3BtreePrevious() so that they return
SQLITE_DONE if they have already reached the end (or beginning) of the table.
This gives a performance increase and size reduc

Change sqlite3BtreeNext() and sqlite3BtreePrevious() so that they return
SQLITE_DONE if they have already reached the end (or beginning) of the table.
This gives a performance increase and size reduction.

FossilOrigin-Name: e972a3860892022d57b26ec44ce0fbadc61c1ff54b7a10b7e82390db88d323a7

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Smaller and faster vdbeSorterCompareText().

FossilOrigin-Name: 542dc4c5eb87017fe03b6c181e779993aa84564785e1177ccf937d52f985593b

Slightly smaller and faster implementation for vdbeSorterCompareInt().

FossilOrigin-Name: 84fa069c5bdfe41d03d03875c9157cc6785150b677c04e40b8916ba5af073dc8

Simplifications to the way UnpackedRecord objects are allocated. Smaller
and faster code that also fixes a subtle (currently unreachable) bug.

FossilOrigin-Name: f7ab01f254cd9d7006b8dec29adb234a671

Simplifications to the way UnpackedRecord objects are allocated. Smaller
and faster code that also fixes a subtle (currently unreachable) bug.

FossilOrigin-Name: f7ab01f254cd9d7006b8dec29adb234a671b8e6f

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Reorder the fields in the VdbeCursor object so that those that need to be
bulk zeroed on allocation are grouped at the beginning, and the memset()
only runs over those fields that really need it.

Fo

Reorder the fields in the VdbeCursor object so that those that need to be
bulk zeroed on allocation are grouped at the beginning, and the memset()
only runs over those fields that really need it.

FossilOrigin-Name: 8165f88bb1d40693d67005a8d5dc499085f64b91

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Optimizations to link list merge sort code in vdbesort.c, pcache.c, and
rowset.c. Resulting binaries are 10 bytes smaller and use 0.03% fewer CPU
cycles.

FossilOrigin-Name: 9033afbb31b28a8ad6856ac1

Optimizations to link list merge sort code in vdbesort.c, pcache.c, and
rowset.c. Resulting binaries are 10 bytes smaller and use 0.03% fewer CPU
cycles.

FossilOrigin-Name: 9033afbb31b28a8ad6856ac1f773d8e83bc9ec1c

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Correctly interpret negative "PRAGMA cache_size" values when determining the cache-size used for sorting large amounts of data (i.e. the functionality in vdbesort.c).

FossilOrigin-Name: 79147dca87cf

Correctly interpret negative "PRAGMA cache_size" values when determining the cache-size used for sorting large amounts of data (i.e. the functionality in vdbesort.c).

FossilOrigin-Name: 79147dca87cfd7eb62d57baa3b70fa2a8542232a

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Fix a harmless uninitialized variable access.

FossilOrigin-Name: 398522e686b34e7f82a62e62d8b0a0ea924de064

Enhance ability to debug out-of-memory errors.

FossilOrigin-Name: 6a9c4a3ebfb7cc0738ef6634440ccab44a21ff28

Avoid two more instances of pointer arithmetic on freed pointers.

FossilOrigin-Name: 2910ef64097b890c9f8929bf609ea2827db7ac97

Fix a compiler warning about doing pointer arithmetic involving a NULL pointer
even though the result of computation is never used.

FossilOrigin-Name: 7c49a9478bd36564e81d33458ca1f4063ddaca83