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Overview
Comment: | Fix another harmless comment typo. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
b45bc80bb16f07192d84fd14433bb724 |
User & Date: | drh 2014-11-07 14:37:32.349 |
Context
2014-11-07
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14:41 | Add new test file e_blobopen.test, containing tests for sqlite3_blob_open(). (check-in: ecbccd0e59 user: dan tags: trunk) | |
14:37 | Fix another harmless comment typo. (check-in: b45bc80bb1 user: drh tags: trunk) | |
13:52 | In the ".scanstats on" output from the shell, round the estRows value to the nearest integer, rather than rounding toward zero. (check-in: 5700508535 user: drh tags: trunk) | |
Changes
Changes to src/sqliteInt.h.
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558 559 560 561 562 563 564 | /* ** Estimated quantities used for query planning are stored as 16-bit ** logarithms. For quantity X, the value stored is 10*log2(X). This ** gives a possible range of values of approximately 1.0e986 to 1e-986. ** But the allowed values are "grainy". Not every value is representable. ** For example, quantities 16 and 17 are both represented by a LogEst | | | 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 | /* ** Estimated quantities used for query planning are stored as 16-bit ** logarithms. For quantity X, the value stored is 10*log2(X). This ** gives a possible range of values of approximately 1.0e986 to 1e-986. ** But the allowed values are "grainy". Not every value is representable. ** For example, quantities 16 and 17 are both represented by a LogEst ** of 40. However, since LogEst quantities are suppose to be estimates, ** not exact values, this imprecision is not a problem. ** ** "LogEst" is short for "Logarithmic Estimate". ** ** Examples: ** 1 -> 0 20 -> 43 10000 -> 132 ** 2 -> 10 25 -> 46 25000 -> 146 |
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