Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/752#discussion_r103057873
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/mock/MockGroupScanPOP.java
---
@@ -75,20 +76,50 @@
*/
private boolean extended;
+ private ScanStats scanStats = ScanStats.TRIVIAL_TABLE;
@JsonCreator
public MockGroupScanPOP(@JsonProperty("url") String url,
- @JsonProperty("extended") Boolean extended,
@JsonProperty("entries") List<MockScanEntry> readEntries) {
super((String) null);
this.readEntries = readEntries;
this.url = url;
- this.extended = extended == null ? false : extended;
+
+ // Compute decent row-count stats for this mock data source so that
+ // the planner is "fooled" into thinking that this operator wil do
+ // disk I/O.
+
+ int rowCount = 0;
+ int rowWidth = 0;
+ for (MockScanEntry entry : readEntries) {
+ rowCount += entry.getRecords();
+ int width = 0;
+ if (entry.getTypes() == null) {
+ width = 50;
+ } else {
+ for (MockColumn col : entry.getTypes()) {
+ int colWidth = 0;
+ if (col.getWidthValue() == 0) {
+ colWidth = TypeHelper.getSize(col.getMajorType());
+ } else {
+ colWidth = col.getWidthValue();
+ }
+ colWidth *= col.getRepeatCount();
+ width += colWidth;
+ }
+ }
+ rowWidth = Math.max(rowWidth, width);
--- End diff --
Revised names and added comments to make clear what's going on.
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