将多个变量转换为日期会导致错误

Question

我有一个Denodo视图，其中有四列类型为long的列，指示出生日期的元素。如果缺少日期，则所有四个列都填充0。我尝试将它们转换为单个日期列，如下所示：

SELECT CASE WHEN a.gbjh = 0 THEN NULL
       ELSE TO_LOCALDATE('yyyyMMdd', CONCAT(CAST('text', a.gbjh),
                                            CAST('int', a.gbj),
                                            CAST('int', a.gbm),
                                            CAST('int', a.gbt))) 
       END AS birth_date
FROM source_table AS a

这将产生QUERY [VIRTUAL] [ERROR]。

有趣的是，TO_LOCALDATE('yyyyMMdd', CONCAT(CAST('int', a.gbjh), CAST('int', a.gbj), '01', '01')) END AS birth_date起作用。

执行跟踪摘录：

QUERY: SELECT * FROM aux_partner0 LIMIT 150 CONTEXT ('i18n'='de_euro', 'cache_wait_for_load'='true') TRACE

EXECUTION PLAN (
    name = Execution
    startTime = Thu May 14 08:20:26 646 CEST 2020
    endTime = Thu May 14 08:20:35 123 CEST 2020
    responseTime = -
    numRows = 0
    state = ERROR
    completed = false
    waitingTime = 0
    STATIC OPTIMIZATION (
        staticOptimized = false
        staticOptimizationTime = 6
        staticOptimizationStart = Thu May 14 08:20:26 649 CEST 2020
        staticOptimizationEnd = Thu May 14 08:20:26 655 CEST 2020
    )
    COST OPTIMIZATION (
        costOptimized = false
        costOptimizationMessages = [Missing statistics or not activated in the following nodes: bv_01057_pndaktion,bv_01057_ptke,bv_01057_ptph1,bv_01057_ptzahlungskanal]
    )
    VIRTUAL PLAN (
        name = aux_partner0
        database = sdp_uc_claimscontrolling
        startTime = Thu May 14 08:20:26 657 CEST 2020
        endTime = Thu May 14 08:20:35 123 CEST 2020
        responseTime = -
        numRows = 0
        state = ERROR
        completed = false
        fields = [...]
        search conditions = []
        filter conditions = []
        orderByFields = []
        ordered = false
        numOfFilteredTuples = 0
        numOfDuplicatedTuples = 0
        numOfSwappedTuples = 0
        swapping = false
        memoryLimitReached = false
        mainTime = 0 ns
        distinct = true
        viewType = PROJECT
        indexes = []
    )
)

关于什么可能导致此问题的想法？