Coerce partial-index rename test for SQL Server boolean predicate syntax

[Copilot]

The CI failure came from ActiveRecord::Migration::IndexTest#test_rename_index_preserves_where_clause generating a SQL Server partial index with an invalid bare boolean predicate (administrator). SQL Server requires an explicit truthy comparison for BIT columns.

• Scope

  • Add a SQL Server-specific coerced variant of test_rename_index_preserves_where_clause in test/cases/coerced_tests.rb.

• Behavior change

  • Use a SQL Server-compatible partial index predicate (administrator = 1) while keeping the test’s intent unchanged: verify the where clause is preserved across rename_index.

• Why this resolves the failure

  • Avoids invalid SQL generation in this adapter context and preserves coverage of rename semantics for filtered indexes.

connection.add_index(table_name, [:foo], name: "old_idx", where: "administrator = 1")
old_where = connection.indexes(table_name).find { |i| i.name == "old_idx" }.where

connection.rename_index(table_name, "old_idx", "new_idx")

new_index = connection.indexes(table_name).find { |i| i.name == "new_idx" }
assert_equal old_where, new_index.where