[8.15] ESQL: Validate unique plan attribute names (#110488) #110966
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* Enforce an invariant in our dependency checker so that logical plans never have duplicate output attribute names or ids. * Fix ROW to not produce columns with duplicate names. * Fix ResolveUnionTypes to not create multiple synthetic field attributes for the same union type. * Add tests for commands using the same column name more than once. * Update docs w.r.t. how commands behave if they are used with duplicate column names. (cherry picked from commit da53921) # Conflicts: # x-pack/plugin/esql/qa/testFixtures/src/main/resources/stats.csv-spec # x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java # x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/OptimizerRules.java # x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plan/logical/Rename.java
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These slipped in via merge conflicts.
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