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https://issues.apache.org/jira/browse/ORC-21?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14994705#comment-14994705
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ASF GitHub Bot commented on ORC-21:
-----------------------------------
Github user omalley commented on a diff in the pull request:
https://github.com/apache/orc/pull/12#discussion_r44199545
--- Diff: c++/include/orc/Reader.hh ---
@@ -709,6 +709,16 @@ namespace orc {
* @return a string of bytes with the file tail
*/
virtual std::string getSerializedFileTail() const = 0;
+
+ /**
+ * Estimate an upper bound on heap memory allocation by the Reader
+ * based on the information in the file footer.
+ * The bound is less tight if only few columns are read or compression
is used.
+ * @param stripeIx index of the stripe to be read (if not specified,
+ * all stripes are considered).
+ * @return upper bound on memory use
+ */
+ virtual uint64_t memoryUse(int stripeIx=-1) = 0;
--- End diff --
Please use getMemoryUse().
> Add functionality to estimate memory footprint
> ----------------------------------------------
>
> Key: ORC-21
> URL: https://issues.apache.org/jira/browse/ORC-21
> Project: Orc
> Issue Type: Task
> Reporter: Aliaksei Sandryhaila
> Assignee: Aliaksei Sandryhaila
>
> ORC library allocates multiple large buffers to read and materialize ORC
> files. For stability of applications that use the library, it may be
> desirable to have an estimate (preferably, a tight upper bound) of a memory
> footprint.
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