UnaryExpression¶

UnaryExpression is an extension of the Expression abstraction for expressions with a single child.

Contract¶

Child Expression¶

child: Expression

Child Expression

Implementations¶

• Alias
• ArrayDistinct
• ArrayMax
• ArrayMin
• BitwiseCount
• CsvToStructs
• MapEntries
• MapKeys
• MapValues
• MultiAlias
• PrintToStderr
• SchemaOfCsv
• others...

Interpreted Expression Evaluation¶

eval(
  input: InternalRow): Any

eval...FIXME

eval is part of the Expression abstraction.

defineCodeGen¶

defineCodeGen(
  ctx: CodegenContext,
  ev: ExprCode,
  f: String => String): ExprCode

defineCodeGen...FIXME

nullSafeCodeGen¶

nullSafeCodeGen(
  ctx: CodegenContext,
  ev: ExprCode,
  f: String => String): ExprCode

nullSafeCodeGen...FIXME

nullSafeCodeGen is used when...FIXME

nullSafeEval¶

nullSafeEval(
  input: Any): Any

nullSafeEval simply fails with the following error (and is expected to be overrided to save null-check code):

UnaryExpressions must override either eval or nullSafeEval

nullSafeEval is used when UnaryExpression is requested to evaluate (in interpreted mode).