test: update order.slt plans for log() float widening

c11 is Float32 and c12 is Float64, so log() now widens c11 to Float64 during
coercion. The sorts are still kept.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: U0001F3A2

datafusion/sqllogictest/test_files/order.slt

@@ -957,12 +957,12 @@ query TT
 ----
 logical_plan
 01)Sort: log_c11_base_c12 ASC NULLS LAST
-02)--Projection: log(aggregate_test_100.c12, aggregate_test_100.c11) AS log_c11_base_c12
+02)--Projection: log(aggregate_test_100.c12, CAST(aggregate_test_100.c11 AS Float64)) AS log_c11_base_c12
 03)----TableScan: aggregate_test_100 projection=[c11, c12]
 physical_plan
 01)SortPreservingMergeExec: [log_c11_base_c12@0 ASC NULLS LAST]
 02)--SortExec: expr=[log_c11_base_c12@0 ASC NULLS LAST], preserve_partitioning=[true]
-03)----ProjectionExec: expr=[log(c12@1, c11@0) as log_c11_base_c12]
+03)----ProjectionExec: expr=[log(c12@1, CAST(c11@0 AS Float64)) as log_c11_base_c12]
 04)------RepartitionExec: partitioning=RoundRobinBatch(4), input_partitions=1, maintains_sort_order=true
 05)--------DataSourceExec: file_groups={1 group: [[WORKSPACE_ROOT/testing/data/csv/aggregate_test_100.csv]]}, projection=[c11, c12], output_orderings=[[c11@0 ASC NULLS LAST], [c12@1 DESC NULLS LAST]], file_type=csv, has_header=true
 
@@ -973,12 +973,12 @@ ORDER BY log_c12_base_c11 DESC NULLS LAST;
 ----
 logical_plan
 01)Sort: log_c12_base_c11 DESC NULLS LAST
-02)--Projection: log(aggregate_test_100.c11, aggregate_test_100.c12) AS log_c12_base_c11
+02)--Projection: log(CAST(aggregate_test_100.c11 AS Float64), aggregate_test_100.c12) AS log_c12_base_c11
 03)----TableScan: aggregate_test_100 projection=[c11, c12]
 physical_plan
 01)SortPreservingMergeExec: [log_c12_base_c11@0 DESC NULLS LAST]
 02)--SortExec: expr=[log_c12_base_c11@0 DESC NULLS LAST], preserve_partitioning=[true]
-03)----ProjectionExec: expr=[log(c11@0, c12@1) as log_c12_base_c11]
+03)----ProjectionExec: expr=[log(CAST(c11@0 AS Float64), c12@1) as log_c12_base_c11]
 04)------RepartitionExec: partitioning=RoundRobinBatch(4), input_partitions=1, maintains_sort_order=true
 05)--------DataSourceExec: file_groups={1 group: [[WORKSPACE_ROOT/testing/data/csv/aggregate_test_100.csv]]}, projection=[c11, c12], output_orderings=[[c11@0 ASC NULLS LAST], [c12@1 DESC NULLS LAST]], file_type=csv, has_header=true