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y
yq
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Column
Returns the column of the matching node. Starts from 1, 0 indicates there was no column data.
Note that versions prior to 4.18 require the 'eval/e' command to be specified.
yq e <exp> <file>

Returns column of value node

Given a sample.yml file of:
1
a: cat
2
b: bob
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then
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yq '.b | column' sample.yml
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will output
1
4
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Returns column of key node

Pipe through the key operator to get the column of the key
Given a sample.yml file of:
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a: cat
2
b: bob
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then
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yq '.b | key | column' sample.yml
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will output
1
1
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First column is 1

Given a sample.yml file of:
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a: cat
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then
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yq '.a | key | column' sample.yml
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will output
1
1
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No column data is 0

Running
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yq --null-input '{"a": "new entry"} | column'
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will output
1
0
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