EP_WinFunc property that is only true if Expr.y.pWin is a valid pointer.
This reduces the size of the Expr object by 8 bytes, reduces the overall
amount of code, and shaves over 1 million cycles off of the speed test.
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column is being coded as a constant, make sure the affinity is correct.
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a persistent source of bugs for years and with recent improvements
in the performance of OP_Column, it no longer provides a benefit. After
the column cache is removed, the binary is almost 2KB smaller and the
speed-check.sh performance test is over 3 million cycles faster.
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a prepared statement (the Parse.pConstExpr expressions) pass the
sqlite3ExprIsConstantNotJoin() test. It is not sufficient to pass just the
sqlite3ExprIsConstant() test as that would allow through column references
that are bound to constants by the WHERE clause in the constant propagation
optimization. This fixes a problem discovered by OSSFuzz.
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of bugs for many years. We recent enhancements to the performance of the
OP_Column opcode, the removing the column cache actually makes speed-check.sh
run faster. It also saves about 1,800 bytes of code space.
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WHERE-clause constant propagation optimization to be moved to the init-time
constant expression list, as the table reference will not work there.
This fixes a problem found by OSSFuzz.
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at least one expresssion is required after PARTITION BY and within the
list of expressions on VALUES().
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only scenario where it is useful. This saves prepare time for the common
case of a simple query.
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mechanism is changed to take affinity and collation into account. This
seems to give correct answers. But the search for constant propagation
costs 4 million cycles in the speed test.
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WHERE close, not just those that contain a subquery. This then demonstrates
that the current implementation is inadequate since it does not take into
account collating sequences.
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integers rather than "0x%p". This is more readable and yields the same result
on successive runs.
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check-in. Simplify the ORDER BY dereferencing logic so that it avoids
unreachable branches.
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must both have OVER clauses, or neither has an OVER clause. Use this fact
to simplify expression comparison.
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the xBestIndex method and used by the xFilter method of a virtual table.
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IN operators where the RHS is a list and not a subquery, since in that case
there is no SUBQUERY to execute.
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that some required values may be loaded from the database after external
sorting occurs for SELECT statements with ORDER BY clauses that are not
satisfied by database indexes.
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dissimilar expressions to match if they have the same "COLLATE name" at
the outer layer.
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