Implementação do método str.cat() para concatenação de strings #17
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Descrição
Este PR implementa o método
str.cat()para a classeLazyStringColumn, permitindo a concatenação de colunas de strings com um separador opcional. Esta implementação resolve o Issue #14.Implementação
cat()à classeLazyStringColumnutilizando a funçãoconcat_wsdo DuckDBObservações
É importante notar que o comportamento do DuckDB com valores NULL difere do pandas:
Os testes foram adaptados para refletir esse comportamento específico do DuckDB.
Testes
Todos os 133 testes do projeto estão passando, incluindo os novos testes para a funcionalidade de concatenação de strings.
Resolve #14