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15 lines
647 B
Plaintext
15 lines
647 B
Plaintext
{
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"name": "count_missing",
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"type": "function",
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"groups": ["Aggregates"],
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"description": "Returns the count of missing (NULL) values.",
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"arguments": [
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{"arg":"expression", "description":"sub expression of field to aggregate"},
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{"arg":"group_by", "optional":true, "description":"optional expression to use to group aggregate calculations"},
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{"arg":"filter", "optional":true, "description":"optional expression to use to filter features used to calculate aggregate"}
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],
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"examples": [
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{ "expression":"count_missing(\"stations\",group_by:=\"state\")", "returns":"count of missing (NULL) station values, grouped by state field"}
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]
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}
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