cryptoe commented on a change in pull request #12139:
URL: https://github.com/apache/druid/pull/12139#discussion_r783645116
##########
File path:
server/src/main/java/org/apache/druid/server/ClientQuerySegmentWalker.java
##########
@@ -592,6 +642,48 @@ private DataSource insertSubqueryIds(
return InlineDataSource.fromIterable(resultList, signature);
}
+ private static long estimateResultRowSize(Object[] row, RowSignature
rowSignature)
+ {
+ int estimate = 0;
+ if (row == null) {
+ return 0;
+ }
+ estimate += 24; // Add memory overhead for the row array
+ for (int i = 0; i < rowSignature.size(); ++i) {
+ Optional<ColumnType> maybeColumnType = rowSignature.getColumnType(i);
+ if (!maybeColumnType.isPresent()) {
+ // This shouldn't be encountered
+ continue;
+ }
+ ColumnType columnType = maybeColumnType.get();
+ if (columnType.equals(ColumnType.LONG)) {
+ estimate += Long.BYTES;
+ } else if (columnType.equals(ColumnType.FLOAT)) {
+ estimate += Float.BYTES;
+ } else if (columnType.equals(ColumnType.DOUBLE)) {
+ estimate += Double.BYTES;
+ } else if (columnType.equals(ColumnType.STRING)
+ || columnType.equals(ColumnType.STRING_ARRAY)
+ || columnType.equals(ColumnType.LONG_ARRAY)
+ || columnType.equals(ColumnType.DOUBLE_ARRAY)) {
+ if (row[i] instanceof String) {
+ estimate += 28 + 16 + 2 * (((String) row[i]).length());
+ } else if (row[i] instanceof Long) {
+ estimate += Long.BYTES;
+ } else if (row[i] instanceof Double) {
+ estimate += Double.BYTES;
+ } else if (row[i] instanceof Float) {
+ estimate += Float.BYTES;
+ } else {
+ estimate += 0;
Review comment:
We might want to call out that we do a conservative/underestimate in
case of unknown col's somewhere in the property documentation.
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