Uses of Interface
org.apache.flink.table.expressions.Expression

Packages that use Expression

Package	Description
org.apache.flink.table.api
org.apache.flink.table.catalog
org.apache.flink.table.expressions
org.apache.flink.table.functions
org.apache.flink.table.legacy.sources

Uses of Expression in org.apache.flink.table.api

Methods in org.apache.flink.table.api that return Expression

Modifier and Type	Method	Description
Expression	Schema.UnresolvedComputedColumn.getExpression()
Expression	Schema.UnresolvedWatermarkSpec.getWatermarkExpression()

Methods in org.apache.flink.table.api with parameters of type Expression

Modifier and Type	Method	Description
Schema.Builder	Schema.Builder.columnByExpression(String columnName, Expression expression)	Declares a computed column that is appended to this schema.
Schema.Builder	Schema.Builder.watermark(String columnName, Expression watermarkExpression)	Declares that the given column should serve as an event-time (i.e. rowtime) attribute and specifies a corresponding watermark strategy as an expression.

Constructors in org.apache.flink.table.api with parameters of type Expression

Constructor	Description
UnresolvedComputedColumn(String columnName, Expression expression)
UnresolvedComputedColumn(String columnName, Expression expression, String comment)
UnresolvedWatermarkSpec(String columnName, Expression watermarkExpression)

Uses of Expression in org.apache.flink.table.catalog

Method parameters in org.apache.flink.table.catalog with type arguments of type Expression

Modifier and Type	Method	Description
List<CatalogPartitionSpec>	Catalog.listPartitionsByFilter(ObjectPath tablePath, List<Expression> filters)	Get CatalogPartitionSpec of partitions by expression filters in the table.

Uses of Expression in org.apache.flink.table.expressions

Subinterfaces of Expression in org.apache.flink.table.expressions

Modifier and Type	Interface	Description
interface	ResolvedExpression	Expression that has been fully resolved and validated.

Classes in org.apache.flink.table.expressions that implement Expression

Modifier and Type	Class	Description
class	AggregateExpression	Resolved and validated expression for calling an aggregate function.
class	CallExpression	Resolved and validated call expression for calling a function.
class	FieldReferenceExpression	A reference to a field in an input.
class	NestedFieldReferenceExpression	A reference to a nested field in an input.
class	SqlCallExpression	A call to a SQL expression.
class	TypeLiteralExpression	Expression that wraps DataType as a literal.
class	ValueLiteralExpression	Expression for constant literal values.

Methods in org.apache.flink.table.expressions that return types with arguments of type Expression

Modifier and Type	Method	Description
List<Expression>	AggregateExpression.getChildren()
List<Expression>	CallExpression.getChildren()
List<Expression>	Expression.getChildren()
List<Expression>	FieldReferenceExpression.getChildren()
List<Expression>	NestedFieldReferenceExpression.getChildren()
List<Expression>	SqlCallExpression.getChildren()
List<Expression>	TypeLiteralExpression.getChildren()
List<Expression>	ValueLiteralExpression.getChildren()

Methods in org.apache.flink.table.expressions with parameters of type Expression

Modifier and Type	Method	Description
protected abstract T	ExpressionDefaultVisitor.defaultMethod(Expression expression)
static <V> Optional<V>	ExpressionUtils.extractValue(Expression expression, Class<V> targetClass)	Extracts the value (excluding null) of a given class from an expression assuming it is a ValueLiteralExpression.
static String	ExpressionUtils.stringValue(Expression expression)
T	ExpressionDefaultVisitor.visit(Expression other)
R	ExpressionVisitor.visit(Expression other)

Uses of Expression in org.apache.flink.table.functions

Methods in org.apache.flink.table.functions with parameters of type Expression

Modifier and Type	Method	Description
SpecializedFunction.ExpressionEvaluator	SpecializedFunction.ExpressionEvaluatorFactory.createEvaluator(Expression expression, DataType outputDataType, DataTypes.Field... args)	Creates a serializable factory that can be passed into a UserDefinedFunction for evaluating an Expression during runtime.

Uses of Expression in org.apache.flink.table.legacy.sources

Methods in org.apache.flink.table.legacy.sources that return Expression

Modifier and Type	Method	Description
Expression	FieldComputer.getExpression(ResolvedFieldReference[] fieldAccesses)	Deprecated. Returns the Expression that computes the value of the field.

Method parameters in org.apache.flink.table.legacy.sources with type arguments of type Expression

Modifier and Type	Method	Description
TableSource<T>	FilterableTableSource.applyPredicate(List<Expression> predicates)	Deprecated. Check and pick all predicates this table source can support.