Function IsKeyColumn

backend/query/query_engine.cc:240–244

}

bool IsKeyColumn(const googlesql::Table* table,
                 const std::string& column_name) {
  return table->GetAs<QueryableTable>()->wrapped_table()->FindKeyColumn(
             column_name) != nullptr;
}

// Simple visitor to traverse an expression and check if it references
// a pending commit timestamp value column (that is, a column set to