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Jeffrey Heer
UW Computer Science Professor. Co-Founder of Trifacta. Data, visualization & interaction. @uwdata @trifacta @d3 @vega
Published
Edited
Feb 14, 2021
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table = aq.toArrow([
{ s: { a: 1, b: 'a' } },
{ s: { a: 2, b: 'b' } },
{ s: { a: 3, b: 'c' } }
])
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table.schema.fields[0].type // is struct-typed? (yes)
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table.schema.fields[0].type.typeId === Arrow.Type.Struct // type id matches, too
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[...table] // table maps to an array of Maps
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[...table.getColumn('s')] // struct column also maps to Maps
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table.getColumn('s').get(0) instanceof Map // check column value instance
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table.getColumn('s').get(0).get('a') // is a Map
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table.getColumn('s').get(0)['a'] // is also a Proxy
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