Class NamedExpressions
java.lang.Object
org.elasticsearch.xpack.esql.expression.NamedExpressions
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionmergeOutputAttributes(List<? extends NamedExpression> fields, List<? extends NamedExpression> childOutput) Calculates the actual output of a command given the new attributes plus the existing inputs that are emitted as outputsstatic List<NamedExpression> mergeOutputExpressions(List<? extends NamedExpression> fields, List<? extends NamedExpression> childOutput) Merges output expressions of a command given the new attributes plus the existing inputs that are emitted as outputs.
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Constructor Details
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NamedExpressions
public NamedExpressions()
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Method Details
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mergeOutputAttributes
public static List<Attribute> mergeOutputAttributes(List<? extends NamedExpression> fields, List<? extends NamedExpression> childOutput) Calculates the actual output of a command given the new attributes plus the existing inputs that are emitted as outputs- Parameters:
fields- the fields added by the commandchildOutput- the command input that has to be propagated as output- Returns:
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mergeOutputExpressions
public static List<NamedExpression> mergeOutputExpressions(List<? extends NamedExpression> fields, List<? extends NamedExpression> childOutput) Merges output expressions of a command given the new attributes plus the existing inputs that are emitted as outputs. As a general rule, child output will come first in the list, followed by the new fields. In case of name collisions, only the last entry is preserved (previous expressions with the same name are discarded) and the new attributes have precedence over the child output.- Parameters:
fields- the fields added by the commandchildOutput- the command input that has to be propagated as output- Returns:
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