Package org.apache.calcite.sql.validate
Class DelegatingNamespace
- java.lang.Object
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- org.apache.calcite.sql.validate.DelegatingNamespace
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- All Implemented Interfaces:
SqlValidatorNamespace
public abstract class DelegatingNamespace extends java.lang.Object implements SqlValidatorNamespace
An implementation ofSqlValidatorNamespace
that delegates all methods to an underlying object.
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Field Summary
Fields Modifier and Type Field Description protected SqlValidatorNamespace
namespace
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Constructor Summary
Constructors Modifier Constructor Description protected
DelegatingNamespace(SqlValidatorNamespace namespace)
Creates a DelegatingNamespace.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
fieldExists(java.lang.String name)
Returns whether this namespace has a field of a given name.SqlNode
getEnclosingNode()
Returns the parse tree node that at is at the root of this namespace and includes all decorations.java.util.List<Pair<SqlNode,SqlMonotonicity>>
getMonotonicExprs()
Returns a list of expressions which are monotonic in this namespace.SqlMonotonicity
getMonotonicity(java.lang.String columnName)
Returns whether and how a given column is sorted.SqlNode
getNode()
Returns the parse tree node at the root of this namespace.RelDataType
getRowType()
Returns the row type of this namespace, which comprises a list of names and types of the output columns.RelDataType
getRowTypeSansSystemColumns()
Returns the row type of this namespace, sans any system columns.SqlValidatorTable
getTable()
Returns the underlying table, or null if there is none.RelDataType
getType()
Returns the type of this namespace.SqlValidator
getValidator()
Returns the validator.boolean
isWrapperFor(java.lang.Class<?> clazz)
Returns whether this namespace implements a given interface, or wraps a class which does.SqlValidatorNamespace
lookupChild(java.lang.String name)
Looks up a child namespace of a given name.void
makeNullable()
void
setType(RelDataType type)
Sets the type of this namespace.<T> T
unwrap(java.lang.Class<T> clazz)
Returns this namespace, or a wrapped namespace, cast to a particular class.void
validate(RelDataType targetRowType)
Validates this namespace.-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.calcite.sql.validate.SqlValidatorNamespace
resolve, supportsModality
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Field Detail
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namespace
protected final SqlValidatorNamespace namespace
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Constructor Detail
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DelegatingNamespace
protected DelegatingNamespace(SqlValidatorNamespace namespace)
Creates a DelegatingNamespace.- Parameters:
namespace
- Underlying namespace, to delegate to
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Method Detail
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getValidator
public SqlValidator getValidator()
Description copied from interface:SqlValidatorNamespace
Returns the validator.- Specified by:
getValidator
in interfaceSqlValidatorNamespace
- Returns:
- validator
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getTable
public SqlValidatorTable getTable()
Description copied from interface:SqlValidatorNamespace
Returns the underlying table, or null if there is none.- Specified by:
getTable
in interfaceSqlValidatorNamespace
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getRowType
public RelDataType getRowType()
Description copied from interface:SqlValidatorNamespace
Returns the row type of this namespace, which comprises a list of names and types of the output columns. If the scope's type has not yet been derived, derives it.- Specified by:
getRowType
in interfaceSqlValidatorNamespace
- Returns:
- Row type of this namespace, never null, always a struct
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setType
public void setType(RelDataType type)
Description copied from interface:SqlValidatorNamespace
Sets the type of this namespace.Allows the type for the namespace to be explicitly set, but usually is called during
SqlValidatorNamespace.validate(RelDataType)
.Implicitly also sets the row type. If the type is not a struct, then the row type is the type wrapped as a struct with a single column, otherwise the type and row type are the same.
- Specified by:
setType
in interfaceSqlValidatorNamespace
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getRowTypeSansSystemColumns
public RelDataType getRowTypeSansSystemColumns()
Description copied from interface:SqlValidatorNamespace
Returns the row type of this namespace, sans any system columns.- Specified by:
getRowTypeSansSystemColumns
in interfaceSqlValidatorNamespace
- Returns:
- Row type sans system columns
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getType
public RelDataType getType()
Description copied from interface:SqlValidatorNamespace
Returns the type of this namespace.- Specified by:
getType
in interfaceSqlValidatorNamespace
- Returns:
- Row type converted to struct
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validate
public void validate(RelDataType targetRowType)
Description copied from interface:SqlValidatorNamespace
Validates this namespace.If the scope has already been validated, does nothing.
Please call
SqlValidatorImpl.validateNamespace(org.apache.calcite.sql.validate.SqlValidatorNamespace, org.apache.calcite.rel.type.RelDataType)
rather than calling this method directly.- Specified by:
validate
in interfaceSqlValidatorNamespace
- Parameters:
targetRowType
- Desired row type, must not be null, may be the data type 'unknown'.
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getNode
public SqlNode getNode()
Description copied from interface:SqlValidatorNamespace
Returns the parse tree node at the root of this namespace.- Specified by:
getNode
in interfaceSqlValidatorNamespace
- Returns:
- parse tree node; null for
TableNamespace
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getEnclosingNode
public SqlNode getEnclosingNode()
Description copied from interface:SqlValidatorNamespace
Returns the parse tree node that at is at the root of this namespace and includes all decorations. If there are no decorations, returns the same asSqlValidatorNamespace.getNode()
.- Specified by:
getEnclosingNode
in interfaceSqlValidatorNamespace
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lookupChild
public SqlValidatorNamespace lookupChild(java.lang.String name)
Description copied from interface:SqlValidatorNamespace
Looks up a child namespace of a given name.For example, in the query
select e.name from emps as e
,e
is anIdentifierNamespace
which has a childname
which is aFieldNamespace
.- Specified by:
lookupChild
in interfaceSqlValidatorNamespace
- Parameters:
name
- Name of namespace- Returns:
- Namespace
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fieldExists
public boolean fieldExists(java.lang.String name)
Description copied from interface:SqlValidatorNamespace
Returns whether this namespace has a field of a given name.- Specified by:
fieldExists
in interfaceSqlValidatorNamespace
- Parameters:
name
- Field name- Returns:
- Whether field exists
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getMonotonicExprs
public java.util.List<Pair<SqlNode,SqlMonotonicity>> getMonotonicExprs()
Description copied from interface:SqlValidatorNamespace
Returns a list of expressions which are monotonic in this namespace. For example, if the namespace represents a relation ordered by a column called "TIMESTAMP", then the list would contain aSqlIdentifier
called "TIMESTAMP".- Specified by:
getMonotonicExprs
in interfaceSqlValidatorNamespace
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getMonotonicity
public SqlMonotonicity getMonotonicity(java.lang.String columnName)
Description copied from interface:SqlValidatorNamespace
Returns whether and how a given column is sorted.- Specified by:
getMonotonicity
in interfaceSqlValidatorNamespace
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makeNullable
public void makeNullable()
- Specified by:
makeNullable
in interfaceSqlValidatorNamespace
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unwrap
public <T> T unwrap(java.lang.Class<T> clazz)
Description copied from interface:SqlValidatorNamespace
Returns this namespace, or a wrapped namespace, cast to a particular class.- Specified by:
unwrap
in interfaceSqlValidatorNamespace
- Parameters:
clazz
- Desired type- Returns:
- This namespace cast to desired type
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isWrapperFor
public boolean isWrapperFor(java.lang.Class<?> clazz)
Description copied from interface:SqlValidatorNamespace
Returns whether this namespace implements a given interface, or wraps a class which does.- Specified by:
isWrapperFor
in interfaceSqlValidatorNamespace
- Parameters:
clazz
- Interface- Returns:
- Whether namespace implements given interface
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