commit eca4d2bc0f7acdd1cc14920f45170874e415fa85
author Hector Dearman <hjd@google.com> Tue May 04 10:17:07 2021 +0100
committer Hector Dearman <hjd@google.com> Tue May 04 10:17:07 2021 +0100
tree b960b9824a433dcd9701bf7b3b41fe91c2ce06d8
parent 395145ab5dbd4c4c1f6ae01c8a63bde2a5612db6

ui: Show thread timestamps in userspace slice details panel

When selecting a slice we gather information form several different
places and displays it together in the details panel.

Previously there were three places:
- columns of the slice table
- The arguments associated with the slice (if any)
- The 'description' generated by trace_processor

Since we only looked at the root table (slice) this missed some
information that could be present on the subclass table of the slice.
On Chrome slices for example the thread_ts/thread_dur information is
stored on the thread_slice table.

This CL instead finds the 'child-most' or leaf subclass of the slice
table which contains the slice and queries that table appending the
additional columns to the arguments of the slice.

In order to do this we make a few small improvements to the query
iterator methods to:
a) Neatly parse queries which should return at most one row
b) Add support for queries where we do not know the columns at
   build time (i.e. select * from foo;)

Bug: b/141753510
Change-Id: I613fbb80d052725d6e5b308c20a34069861231b1