Release 0.185

Fix excessive CPU usage in coordinator for queries that have large string literals containing non-ASCII characters.
Fix incorrect ordering when the same field appears multiple times with different ordering specifications in a window function ORDER BY clause. For example: OVER (ORDER BY x ASC, x DESC).
Do not allow dropping or renaming hidden columns.
Improve performance of joins where the condition is a range over a function. For example:
Improve performance of certain window functions (e.g., LAG) with similar specifications.
Add cast from JSON to .

Improve ORC reader efficiency by only reading small ORC streams when accessed in the query.
Improve RCFile IO efficiency by increasing the buffer size from 1 to 8 MB.
Fix native memory leak for optimized RCFile writer.