ramitg254 commented on code in PR #6089:
URL: https://github.com/apache/hive/pull/6089#discussion_r2583654940
##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreDirectSql.java:
##########
@@ -1977,116 +2020,96 @@ private List<ColumnStatisticsObj>
aggrStatsUseDB(String catName, String dbName,
// And, we also guarantee that the estimation makes sense by comparing
it to the
// UpperBound (calculated by "sum(\"NUM_DISTINCTS\")")
// and LowerBound (calculated by "max(\"NUM_DISTINCTS\")")
- + "avg((\"LONG_HIGH_VALUE\"-\"LONG_LOW_VALUE\")/cast(\"NUM_DISTINCTS\"
as decimal)),"
- +
"avg((\"DOUBLE_HIGH_VALUE\"-\"DOUBLE_LOW_VALUE\")/\"NUM_DISTINCTS\"),"
- + "avg((cast(\"BIG_DECIMAL_HIGH_VALUE\" as
decimal)-cast(\"BIG_DECIMAL_LOW_VALUE\" as decimal))/\"NUM_DISTINCTS\"),"
- + "sum(\"NUM_DISTINCTS\")" + " from " + PART_COL_STATS + ""
- + " inner join " + PARTITIONS + " on " + PART_COL_STATS +
".\"PART_ID\" = " + PARTITIONS + ".\"PART_ID\""
- + " inner join " + TBLS + " on " + PARTITIONS + ".\"TBL_ID\" = " +
TBLS + ".\"TBL_ID\""
- + " inner join " + DBS + " on " + TBLS + ".\"DB_ID\" = " + DBS +
".\"DB_ID\""
- + " where " + DBS + ".\"CTLG_NAME\" = ? and " + DBS + ".\"NAME\" = ?
and " + TBLS + ".\"TBL_NAME\" = ? ";
+ + "sum((\"LONG_HIGH_VALUE\"-\"LONG_LOW_VALUE\")/cast(\"NUM_DISTINCTS\"
as decimal)),"
+ +
"count((\"LONG_HIGH_VALUE\"-\"LONG_LOW_VALUE\")/cast(\"NUM_DISTINCTS\" as
decimal)),"
+ +
"sum((\"DOUBLE_HIGH_VALUE\"-\"DOUBLE_LOW_VALUE\")/\"NUM_DISTINCTS\"),"
+ +
"count((\"DOUBLE_HIGH_VALUE\"-\"DOUBLE_LOW_VALUE\")/\"NUM_DISTINCTS\"),"
+ + "sum((cast(\"BIG_DECIMAL_HIGH_VALUE\" as
decimal)-cast(\"BIG_DECIMAL_LOW_VALUE\" as decimal))/\"NUM_DISTINCTS\"),"
+ + "count((cast(\"BIG_DECIMAL_HIGH_VALUE\" as
decimal)-cast(\"BIG_DECIMAL_LOW_VALUE\" as decimal))/\"NUM_DISTINCTS\"),"
+ + "sum(\"NUM_DISTINCTS\")" + " from " + PART_COL_STATS + "" + " inner
join " + PARTITIONS + " on "
+ + PART_COL_STATS + ".\"PART_ID\" = " + PARTITIONS + ".\"PART_ID\"" + "
inner join " + TBLS + " on " + PARTITIONS
+ + ".\"TBL_ID\" = " + TBLS + ".\"TBL_ID\"" + " inner join " + DBS + "
on " + TBLS + ".\"DB_ID\" = " + DBS
+ + ".\"DB_ID\"" + " where " + DBS + ".\"CTLG_NAME\" = ? and " + DBS +
".\"NAME\" = ? and " + TBLS
+ + ".\"TBL_NAME\" = ? ";
String queryText = null;
- long start = 0;
- long end = 0;
boolean doTrace = LOG.isDebugEnabled();
ForwardQueryResult<?> fqr = null;
// Check if the status of all the columns of all the partitions exists
// Extrapolation is not needed.
if (areAllPartsFound) {
- queryText = commonPrefix + " and \"COLUMN_NAME\" in (" +
makeParams(colNames.size()) + ")"
- + " and " + PARTITIONS + ".\"PART_NAME\" in (" +
makeParams(partNames.size()) + ")"
- + " and \"ENGINE\" = ? "
- + " group by \"COLUMN_NAME\", \"COLUMN_TYPE\"";
- start = doTrace ? System.nanoTime() : 0;
- try (QueryWrapper query = new
QueryWrapper(pm.newQuery("javax.jdo.query.SQL", queryText))) {
- Object qResult = executeWithArray(query.getInnerQuery(),
- prepareParams(catName, dbName, tableName, partNames, colNames,
- engine), queryText);
- if (qResult == null) {
- return Collections.emptyList();
- }
- end = doTrace ? System.nanoTime() : 0;
- MetastoreDirectSqlUtils.timingTrace(doTrace, queryText, start, end);
- List<Object[]> list = MetastoreDirectSqlUtils.ensureList(qResult);
- List<ColumnStatisticsObj> colStats =
- new ArrayList<ColumnStatisticsObj>(list.size());
- for (Object[] row : list) {
- colStats.add(prepareCSObjWithAdjustedNDV(row, 0,
- useDensityFunctionForNDVEstimation, ndvTuner));
+ queryText = commonPrefix + " and \"COLUMN_NAME\" in (%1$s)" + " and " +
PARTITIONS + ".\"PART_NAME\" in (%2$s)"
+ + " and \"ENGINE\" = ? " + " group by \"COLUMN_NAME\",
\"COLUMN_TYPE\"";
+ Batchable<String, Object[]> b = jobsBatching(queryText, catName, dbName,
tableName, partNames, engine, doTrace);
+ List<ColumnStatisticsObj> colStats = new ArrayList<>(colNames.size());
+ try {
+ List<Object[]> list = Batchable.runBatched(batchSize, colNames, b);
+ Map<String, List<Object[]>> colSubList = columnWiseSubList(list);
+ for (Map.Entry<String, List<Object[]>> entry : colSubList.entrySet()) {
+ colStats.add(columnStatisticsObjWithAdjustedNDV(entry.getValue(), 0,
useDensityFunctionForNDVEstimation, ndvTuner));
Deadline.checkTimeout();
}
- return colStats;
+ } finally {
+ b.closeAllQueries();
}
+ return colStats;
} else {
// Extrapolation is needed for some columns.
// In this case, at least a column status for a partition is missing.
// We need to extrapolate this partition based on the other partitions
List<ColumnStatisticsObj> colStats = new
ArrayList<ColumnStatisticsObj>(colNames.size());
- queryText = "select \"COLUMN_NAME\", \"COLUMN_TYPE\",
count(\"PART_COL_STATS\".\"PART_ID\") "
- + " from " + PART_COL_STATS
- + " inner join " + PARTITIONS + " on " + PART_COL_STATS +
".\"PART_ID\" = " + PARTITIONS + ".\"PART_ID\""
- + " inner join " + TBLS + " on " + PARTITIONS + ".\"TBL_ID\" = " +
TBLS + ".\"TBL_ID\""
- + " inner join " + DBS + " on " + TBLS + ".\"DB_ID\" = " + DBS +
".\"DB_ID\""
- + " where " + DBS + ".\"CTLG_NAME\" = ? and " + DBS + ".\"NAME\" = ?
and " + TBLS + ".\"TBL_NAME\" = ? "
- + " and " + PART_COL_STATS + ".\"COLUMN_NAME\" in (" +
makeParams(colNames.size()) + ")"
- + " and " + PARTITIONS + ".\"PART_NAME\" in (" +
makeParams(partNames.size()) + ")"
- + " and " + PART_COL_STATS + ".\"ENGINE\" = ? "
- + " group by " + PART_COL_STATS + ".\"COLUMN_NAME\", " +
PART_COL_STATS + ".\"COLUMN_TYPE\"";
- start = doTrace ? System.nanoTime() : 0;
+ queryText =
+ "select \"COLUMN_NAME\", \"COLUMN_TYPE\",
count(\"PART_COL_STATS\".\"PART_ID\") " + " from " + PART_COL_STATS
+ + " inner join " + PARTITIONS + " on " + PART_COL_STATS +
".\"PART_ID\" = " + PARTITIONS + ".\"PART_ID\""
+ + " inner join " + TBLS + " on " + PARTITIONS + ".\"TBL_ID\" = "
+ TBLS + ".\"TBL_ID\"" + " inner join "
+ + DBS + " on " + TBLS + ".\"DB_ID\" = " + DBS + ".\"DB_ID\"" + "
where " + DBS + ".\"CTLG_NAME\" = ? and "
+ + DBS + ".\"NAME\" = ? and " + TBLS + ".\"TBL_NAME\" = ? " + "
and " + PART_COL_STATS
+ + ".\"COLUMN_NAME\" in (%1$s)" + " and " + PARTITIONS +
".\"PART_NAME\" in (%2$s)" + " and "
+ + PART_COL_STATS + ".\"ENGINE\" = ? " + " group by " +
PART_COL_STATS + ".\"COLUMN_NAME\", "
+ + PART_COL_STATS + ".\"COLUMN_TYPE\"";
+
+ Batchable<String, Object[]> b = jobsBatching(queryText, catName, dbName,
tableName, partNames, engine, doTrace);
Review Comment:
done, renamed to `columnWisePartitionBatches`
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