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from ebb28f540 MINOR: improve docstrings on SessionContext (#3603)
add c8a9ea0b5 Simplify `concat_ws(null, ..)` to `null` (#3608)
No new revisions were added by this update.
Summary of changes:
datafusion/optimizer/src/simplify_expressions.rs | 62 ++++++++++++++++++++++--
1 file changed, 59 insertions(+), 3 deletions(-)
