[core] Diff nested schema changes inside ARRAY and MAP value types#7843
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Purpose
Follow-up of #7789. Extend
SchemaMergingUtils.diffSchemaChangesto emit preciseAddColumnfor new struct fields nested insideARRAYelement /MAPvalue, instead of a coarseUpdateColumnTyperewriting the whole nested type.Falls back to
UpdateColumnTypewhen a nested field is removed or a map key type changes.Tests
SchemaMergingUtilsTestMergeIntoTableTestBase