dengzhhu653 commented on code in PR #6602:
URL: https://github.com/apache/hive/pull/6602#discussion_r3869734215
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standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/directsql/DirectSqlAggrStats.java:
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@@ -380,6 +358,61 @@ private List<ColumnStatisticsObj> aggrStatsUseDB(
return colStats;
}
+ private String createQueryString(List<Integer> minMaxStatIndices) {
+ StringBuilder selectClause = new StringBuilder("\"PART_NAME\"");
+ for (int colStatIndex : minMaxStatIndices) {
+ String colStatName = IExtrapolatePartStatus.colStatNames[colStatIndex];
+ selectClause.append(", ");
+ if (IExtrapolatePartStatus.colStatTypes[colStatIndex]
+ == IExtrapolatePartStatus.ColStatType.Decimal) {
+ selectClause.append("cast(\"").append(colStatName).append("\" as
decimal)");
+ } else {
+ selectClause.append("\"").append(colStatName).append("\"");
+ }
+ }
+ return "select " + selectClause + " from " + PART_COL_STATS
Review Comment:
Instead of fetching all rows, we can just fetch the partition name which
has the min/max value, as the partitionStatRows have already contains the
min/max for this column.
if `row[2 + colStatIndex]` is null, stop extrapolating this field, otherwise
add the filter `"cast(\"").append(colStatName).append("\" as decimal) - " +
row[2 + colStatIndex] + " < 0.01 and cast(\"").append(colStatName).append("\"
as decimal) - " + row[2 + colStatIndex] + " > -0.01"`
to the `select` query.
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