我试图用（select，join）查询将数据添加到impala的新列中，一旦我将数据添加到新列中，我将丢失其他列的所有数据（它们将变为null）。
我在这里创建第一个表：

CREATE TABLE mng_exp.KPI_LATENCE_JOUR
(
    CODEINSEE       INT,
    IMEI            BIGINT,
    SEMAINE         INT,
    MOYENNE_LATENCE INT,
    MAXIMUM_LATENCE INT,
    MINIMUM_LATENCE INT
)

我将数据添加到表中：

INSERT INTO mng_exp.KPI_LATENCE_JOUR (CODEINSEE,IMEI, SEMAINE, MOYENNE_LATENCE,MAXIMUM_LATENCE,MINIMUM_LATENCE,TRANCHE_DE_LATENCE) 
SELECT codeinsee, device_dim__imei as IMEI,weekofyear(jour) as SEMAINE, cast(round(avg(rtt_avg_ms)) as integer) as MOYENNE_LATENCE, 
cast(round(avg(rtt_max_ms)) as integer) as MAXIMUM_LATENCE, cast(round(avg(rtt_min_ms)) as integer) as MINIMUM_LATENCE , 
CASE WHEN ( round(avg(rtt_avg_ms)) > 0 and round(avg(rtt_avg_ms)) <= 10 ) THEN 0 
WHEN ( round(avg(rtt_avg_ms)) > 10 and round(avg(rtt_avg_ms)) <= 20 ) THEN 1 
WHEN ( round(avg(rtt_avg_ms)) > 20 and round(avg(rtt_avg_ms)) <= 30 ) THEN 2 
WHEN ( round(avg(rtt_avg_ms)) > 30 ) THEN 3 END AS Tranche_de_latence

FROM mscore.mscore where operateur = 'BT_HZ' and year(jour) = 2019 group by device_dim__imei,weekofyear(jour),codeinsee 

# I  Add a new column

ALTER TABLE mng_exp.kpi_latence_jour ADD COLUMNS (srv_id BIGINT)

# Here data is good and new column srv_id is NULL

我将数据添加到新列：

INSERT INTO mng_exp.KPI_LATENCE_jour (srv_id) 
    SELECT CAST(dng_fai_cli_eqt_iad.srv_id AS BIGINT)
    FROM msf_exploratoire.dng_fai_cli_eqt_iad
    INNER JOIN mng_exp.kpi_latence_jour ON (dng_fai_cli_eqt_iad.num_serie = kpi_latence_jour.imei);

问题是： srv_id 则旧列变为空。
我没有查询错误，但是我丢失了所有的旧数据