例 - Teradata Database - Teradata Vantage NewSQL Engine - METADATAの例です。

SELECT new JSON('{"name":"will","occupation":"engineer","disposition":"silly"}')
.metadata();
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{
    "size":61
    "depth":1
    "keycnt":3
    "objcnt":1
    "arycnt":0
    "strcnt":3
    "nbrcnt":0
    "boolcnt":0
    "nullcnt":0
    "keylen":
    {
        "min":4
        "max":11
        "avg":8
    }
    "strvallen":
    {
        "min":4
        "max":8
        "avg":6
    }
}