XieJiann commented on code in PR #24973:
URL: https://github.com/apache/doris/pull/24973#discussion_r1339579543
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fe/fe-core/src/main/java/org/apache/doris/nereids/stats/FilterEstimation.java:
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@@ -359,31 +364,55 @@ public Statistics visitNot(Not not, EstimationContext
context) {
if (context.statistics.isInputSlotsUnknown(not.getInputSlots())) {
return handleUnknownCase(context);
}
- Statistics childStats = new FilterEstimation().estimate(not.child(),
context.statistics);
+ Expression child = not.child();
+ Statistics childStats = child.accept(this, context);
//if estimated rowCount is 0, adjust to 1 to make upper join reorder
reasonable.
double rowCount = Math.max(context.statistics.getRowCount() -
childStats.getRowCount(), 1);
StatisticsBuilder statisticsBuilder = new
StatisticsBuilder(context.statistics).setRowCount(rowCount);
- for (Entry<Expression, ColumnStatistic> entry :
context.statistics.columnStatistics().entrySet()) {
- Expression expr = entry.getKey();
- ColumnStatistic originColStats = entry.getValue();
- ColumnStatistic childColStats =
childStats.findColumnStatistics(expr);
- double originNonNullCount = Math.max(originColStats.count -
originColStats.numNulls, 0);
- double childNonNullCount = Math.max(childColStats.count -
childColStats.numNulls, 0);
- double supersetValuesPerDistinctValue =
StatsMathUtil.divide(originNonNullCount, originColStats.ndv);
- double subsetValuesPerDistinctValue =
StatsMathUtil.divide(childNonNullCount, childColStats.ndv);
- double ndv;
- if (supersetValuesPerDistinctValue <=
subsetValuesPerDistinctValue) {
- ndv = Math.max(originColStats.ndv - childColStats.ndv, 0);
- } else {
- ndv = originColStats.ndv;
+ // update key col stats
+ for (Slot slot : not.child().getInputSlots()) {
+ ColumnStatistic originColStats =
context.statistics.findColumnStatistics(slot);
+ ColumnStatistic childColStats =
childStats.findColumnStatistics(slot);
+ if (context.isKeySlot(slot)) {
+ ColumnStatisticBuilder colBuilder = new
ColumnStatisticBuilder(childColStats);
+ // update column stats for
+ // 1. not (A=B)
+ // 2. not A in (...)
+ // 3. not A is null
+ // 4. not A like XXX
+ colBuilder.setNumNulls(0);
+ Preconditions.checkArgument(
+ child instanceof EqualTo
+ || child instanceof InPredicate
+ || child instanceof IsNull
+ || child instanceof Like,
+ "Not-predicate meet unexpected child: " +
child.toSql());
+ if (child instanceof Like) {
Review Comment:
use `Preconditions.checkArgument(
child instanceof EqualTo
|| child instanceof InPredicate
|| child instanceof IsNull
|| child instanceof Like,
"Not-predicate meet unexpected child: {} ",
child.toSql())` to avoid construct string when condition is true;
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