englefly commented on code in PR #40349:
URL: https://github.com/apache/doris/pull/40349#discussion_r1767909315
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java:
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@@ -205,6 +210,23 @@ public Map<String, ColumnStatistic>
getTotalColumnStatisticMap() {
return totalColumnStatisticMap;
}
+ /**
+ * disable join reorder if any table row count is not available.
+ */
+ public static void disableJoinReorderIfTableRowCountNotAvailable(
+ List<LogicalOlapScan> scans, CascadesContext context) {
+ StatsCalculator calculator = new StatsCalculator(context);
+ for (LogicalOlapScan scan : scans) {
+ double rowCount = calculator.getOlapTableRowCount(scan);
+ if (rowCount == -1 && ConnectContext.get() != null) {
+ LOG.info("disable join reorder since row count not available: "
+ + scan.getTable().getNameWithFullQualifiers());
+
ConnectContext.get().getSessionVariable().setDisableJoinReorder(true);
Review Comment:
this is statement level. it has no impact on other queries.
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