thelabdude commented on a change in pull request #191:
URL: https://github.com/apache/solr/pull/191#discussion_r658265207
##########
File path: solr/core/src/java/org/apache/solr/handler/sql/SolrTable.java
##########
@@ -275,25 +277,43 @@ private TupleStream handleSelect(String zk,
String fl = getFields(fields);
- if(orders.size() > 0) {
+ if (!orders.isEmpty()) {
params.add(SORT, getSort(orders));
} else {
- if(limit == null) {
+ if (limit == null) {
params.add(SORT, "_version_ desc");
fl = fl+",_version_";
} else {
params.add(SORT, "score desc");
- if(fl.indexOf("score") == -1) {
+ if (!fl.contains("score")) {
fl = fl + ",score";
}
}
}
params.add(CommonParams.FL, fl);
-
+
+ if (offset != null && limit == null) {
+ throw new IOException("OFFSET without LIMIT not supported by Solr!
Specify desired limit using 'FETCH NEXT <LIMIT> ROWS ONLY'");
+ }
+
if (limit != null) {
- params.add(CommonParams.ROWS, limit);
- return new LimitStream(new CloudSolrStream(zk, collection, params),
Integer.parseInt(limit));
+ int limitInt = Integer.parseInt(limit);
+ // if there's an offset, then we need to fetch offset + limit rows from
each shard and then sort accordingly
+ LimitStream limitStream;
+ if (offset != null) {
+ int offsetInt = Integer.parseInt(offset);
+ int rows = limitInt + offsetInt;
+ params.add(CommonParams.START, "0"); // tricky ... we need all rows up
to limit + offset
Review comment:
How would you map a cursor mark to SQL? Not sure why this makes you
nervous as it's not exposing any more risk than people doing:
```
q=*:*&start=1000000000000&rows=10
```
Solr's query interface allows all kinds of dangerous input if people want to
mis-use the parameters.
If you have an idea on how to map cursorMark to SQL I'd appreciate hearing
the details.
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