Package com.mckoi.database
Class QueryPlan.SubsetNode
- java.lang.Object
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- com.mckoi.database.QueryPlan.SingleQueryPlanNode
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- com.mckoi.database.QueryPlan.SubsetNode
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- All Implemented Interfaces:
QueryPlanNode
,java.io.Serializable
,java.lang.Cloneable
- Enclosing class:
- QueryPlan
public static class QueryPlan.SubsetNode extends QueryPlan.SingleQueryPlanNode
The node for finding a subset and renaming the columns of the results in the child node.- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode
child
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Constructor Summary
Constructors Constructor Description SubsetNode(QueryPlanNode child, Variable[] original_columns, Variable[] new_column_names)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
clone()
Deep clone.Table
evaluate(QueryContext context)
Evaluates the node and returns the result as a Table.Variable[]
getNewColumnNames()
Returns the list of new column names that represent the new columns in this subset.Variable[]
getOriginalColumns()
Returns the list of original columns that represent the mappings from the columns in this subset.void
setGivenName(TableName name)
Sets the given table name of the resultant table.java.lang.String
titleString()
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Methods inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode
child, debugString, discoverCorrelatedVariables, discoverTableNames
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Constructor Detail
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SubsetNode
public SubsetNode(QueryPlanNode child, Variable[] original_columns, Variable[] new_column_names)
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Method Detail
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evaluate
public Table evaluate(QueryContext context)
Description copied from interface:QueryPlanNode
Evaluates the node and returns the result as a Table. The VariableResolver resolves any outer variables
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setGivenName
public void setGivenName(TableName name)
Sets the given table name of the resultant table. This is intended if we want to create a sub-query that has an aliased table name.
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getOriginalColumns
public Variable[] getOriginalColumns()
Returns the list of original columns that represent the mappings from the columns in this subset.
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getNewColumnNames
public Variable[] getNewColumnNames()
Returns the list of new column names that represent the new columns in this subset.
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clone
public java.lang.Object clone() throws java.lang.CloneNotSupportedException
Description copied from class:QueryPlan.SingleQueryPlanNode
Deep clone.- Specified by:
clone
in interfaceQueryPlanNode
- Overrides:
clone
in classQueryPlan.SingleQueryPlanNode
- Throws:
java.lang.CloneNotSupportedException
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titleString
public java.lang.String titleString()
- Overrides:
titleString
in classQueryPlan.SingleQueryPlanNode
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