| Commit message (Collapse) | Author | Age | Files | Lines |
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Followup: remove this line from get_column_range_cardinality()
set_if_bigger(res, col_stats->get_avg_frequency());
and make sure it is only used with the binary histograms.
For JSON histograms, it makes the estimates unnecessarily imprecise.
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Fix special handling for values that are right next to buckets with ndv=1.
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Encode such characters in hex.
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Save extra information in the histogram:
"target_histogram_size": nnn,
"collected_at": "(date and time)",
"collected_by": "(server version)",
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Previous JSON parser was using an API which made the parsing
inefficient: the same JSON contents was parsed again and again.
Switch to using a lower-level parsing API which allows to do
parsing in an efficient way.
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- Make Histogram_json_hb::range_selectivity handle singleton buckets
specially when computing selectivity of the max. endpoint bound.
(for min. endpoint, we already do that).
- Also, fixed comments for Histogram_json_hb::find_bucket
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.. for non-existent values.
Handle this special case.
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- Use String::c_ptr_safe() instead of String::c_ptr
- Do proper datatype conversions in Histogram_json_hb::parse
- Remove Histogram_json_hb::Bucket::end_value. Introduce
get_end_value() instead.
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Basic ideas:
1. Store "popular" values in their own buckets.
2. Also store ndv (Number of Distinct Values) in each bucket.
Because of #1, the buckets are now variable-size, so store the size in
each bucket.
Adjust selectivity estimation functions accordingly.
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Remove Histogram_*::is_available(), it is not applicable anymore.
Fix compilation on Windows
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