MetaExpressionProtocol
public protocol MetaExpressionProtocol : ExpressionProtocolMeta expression.
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                  Specifies an alias name of the data source to query the data from. */ DeclarationSwift func from(_ alias: String) -> ExpressionProtocolParametersaliasThe data source alias name. Return ValueThe Meta expression with the given alias name specified. 
 MetaExpressionProtocol Protocol Reference
        MetaExpressionProtocol Protocol Reference