Documentation

IncludesColumn()

IncludesColumn() returns true if some record ID / record key is in a specified set of record IDs / record keys - i.e. if the specified record was returned by a specified row call or not.

Call Definition

IncludesColumn(ROW_CALL, column=UINT_OR_STRING)

Mandatory Arguments

  • ROW_CALL: the row call to compare against
  • column: the record ID or record key we want to check is in or not in the result of ROW_CALL
    • UINT_OR_STRING: unsigned integer for non keyed records or a string for keyed records

Optional Arguments

Returns

  • a boolean: true if UINT_OR_STRING is in the set of record IDs / keys returned by ROW_CALL – false otherwise.

Examples

Data:

Index: customer (non keyed index)

 _id | age (Int) | has_purchased (Set) | last_purchase (Timestamp)
-----+-----------+---------------------+---------------------------
 0   |    23     | ["brand1","brand2"] | 2021-01-05T08:30:00Z
 1   |    31     | ["brand1","brand3"] | 2020-09-12T12:30:00Z
 2   |    28     | ["brand1","brand3"] | 2021-08-06T16:15:00Z
 3   |    19     | []                  | null
 4   |    25     | ["brand1","brand4"] | 2021-10-01T20:45:00Z
 5   |    40     | ["brand4"]          | 2022-01-13T11:00:00Z

Example 1

Question: Has the customer with ID 0 bought from brand1?

Query

[customer]IncludesColumn(
  Row(has_purchased = brand1),
  column = 0
)

Tabular Response

 result
--------
 true

HTTP Response

{
  "results": [
    true
  ]
}

Explanation

Row(has_purchased = brand1) returns [0,1,2,4]. IncludesColumn() returns true because the record with ID 0 is in that set.

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