FrankChen021 commented on code in PR #12833:
URL: https://github.com/apache/druid/pull/12833#discussion_r932813812


##########
docs/configuration/index.md:
##########
@@ -2079,14 +2079,15 @@ Supported runtime properties:
 |`druid.query.groupBy.maxSelectorDictionarySize`|Maximum amount of heap space 
(approximately) to use for per-segment string dictionaries. See [groupBy memory 
tuning and resource 
limits](../querying/groupbyquery.md#memory-tuning-and-resource-limits) for 
details.|100000000|
 |`druid.query.groupBy.maxMergingDictionarySize`|Maximum amount of heap space 
(approximately) to use for per-query string dictionaries. When the dictionary 
exceeds this size, a spill to disk will be triggered. See [groupBy memory 
tuning and resource 
limits](../querying/groupbyquery.md#memory-tuning-and-resource-limits) for 
details.|100000000|
 |`druid.query.groupBy.maxOnDiskStorage`|Maximum amount of disk space to use, 
per-query, for spilling result sets to disk when either the merging buffer or 
the dictionary fills up. Queries that exceed this limit will fail. Set to zero 
to disable disk spilling.|0 (disabled)|
+|`druid.query.groupBy.defaultOnDiskStorage`|Default amount of disk space to 
use, per-query, for spilling the result sets to disk when either the merging 
buffer or the dictionary fills up. Set to zero to disable disk spilling for 
queries who don't override `maxOnDiskStorage` in their 
context.|`druid.query.groupBy.maxOnDiskStorage`|

Review Comment:
   ```suggestion
   |`druid.query.groupBy.defaultOnDiskStorage`|Default amount of disk space to 
use, per-query, for spilling the result sets to disk when either the merging 
buffer or the dictionary fills up. Set to zero to disable disk spilling for 
queries which don't override `maxOnDiskStorage` in their 
context.|`druid.query.groupBy.maxOnDiskStorage`|
   ```



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