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In ORDER BY LIMIT queries, try to evaluate the ORDER BY terms first, and it

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it becomes clear that the row will not come in under the LIMIT, then skip
evaluation of the other columns.

FossilOrigin-Name: c381f0ea57002a264fd958b28e4921cb9c9e73a10fb592f6bb64e6bc9bd16d39
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drh
2018-05-03 23:20:06 +00:00
parent 5e8b9853da bbd4ae5a2f
commit 4388522561
4 changed files with 137 additions and 36 deletions
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7
src/sqliteInt.h
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@@ -2756,11 +2756,8 @@ struct Upsert {
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
**
** nLimit is set to -1 if there is no LIMIT clause. nOffset is set to 0.
** If there is a LIMIT clause, the parser sets nLimit to the value of the
** limit and nOffset to the value of the offset (or 0 if there is not
** offset). But later on, nLimit and nOffset become the memory locations
** in the VDBE that record the limit and offset counters.
** See the header comment on the computeLimitRegisters() routine for a
** detailed description of the meaning of the iLimit and iOffset fields.
**
** addrOpenEphm[] entries contain the address of OP_OpenEphemeral opcodes.
** These addresses must be stored so that we can go back and fill in