Package org.apache.flink.table.expressions

Class ApiExpressionUtils

java.lang.Object
org.apache.flink.table.expressions.ApiExpressionUtils
@Internal public final class ApiExpressionUtils extends Object
Utilities for API-specific Expressions.

  • Field Details

  • Method Details

    • objectToExpression

      public static org.apache.flink.table.expressions.Expression objectToExpression(Object expression)
      Converts a given object to an expression.

      It converts:

      • null to null literal
      • Row to a call to a row constructor expression
      • Map to a call to a map constructor expression
      • List to a call to an array constructor expression
      • arrays to a call to an array constructor expression
      • Scala's Seq to an array constructor via reflection
      • Scala's Map to a map constructor via reflection
      • Scala's BigDecimal to a DECIMAL literal
      • if none of the above applies, the function tries to convert the object to a value literal with valueLiteral(Object)
      Parameters:
      expression - An object to convert to an expression

    • unwrapFromApi

      public static org.apache.flink.table.expressions.Expression unwrapFromApi(org.apache.flink.table.expressions.Expression expression)

    • localRef

      public static LocalReferenceExpression localRef(String name, org.apache.flink.table.types.DataType dataType)

    • valueLiteral

      public static org.apache.flink.table.expressions.ValueLiteralExpression valueLiteral(Object value)

    • valueLiteral

      public static org.apache.flink.table.expressions.ValueLiteralExpression valueLiteral(Object value, org.apache.flink.table.types.DataType dataType)

    • typeLiteral

      public static org.apache.flink.table.expressions.TypeLiteralExpression typeLiteral(org.apache.flink.table.types.DataType dataType)

    • unresolvedRef

      public static UnresolvedReferenceExpression unresolvedRef(String name)

    • unresolvedCall

      public static UnresolvedCallExpression unresolvedCall(ContextResolvedFunction resolvedFunction, org.apache.flink.table.expressions.Expression... args)

    • unresolvedCall

      public static UnresolvedCallExpression unresolvedCall(ContextResolvedFunction resolvedFunction, List<org.apache.flink.table.expressions.Expression> args)

    • unresolvedCall

      public static UnresolvedCallExpression unresolvedCall(org.apache.flink.table.functions.FunctionDefinition functionDefinition, org.apache.flink.table.expressions.Expression... args)

    • unresolvedCall

      public static UnresolvedCallExpression unresolvedCall(org.apache.flink.table.functions.FunctionDefinition functionDefinition, List<org.apache.flink.table.expressions.Expression> args)

    • tableRef

      public static TableReferenceExpression tableRef(String name, Table table)

    • tableRef

      public static TableReferenceExpression tableRef(String name, QueryOperation queryOperation)

    • lookupCall

      public static LookupCallExpression lookupCall(String name, org.apache.flink.table.expressions.Expression... args)

    • sqlCall

      public static org.apache.flink.table.expressions.SqlCallExpression sqlCall(String sqlExpression)

    • toMonthInterval

      public static org.apache.flink.table.expressions.Expression toMonthInterval(org.apache.flink.table.expressions.Expression e, int multiplier)

    • intervalOfMillis

      public static org.apache.flink.table.expressions.ValueLiteralExpression intervalOfMillis(long millis)

    • toMilliInterval

      public static org.apache.flink.table.expressions.Expression toMilliInterval(org.apache.flink.table.expressions.Expression e, long multiplier)

    • intervalOfMonths

      public static org.apache.flink.table.expressions.ValueLiteralExpression intervalOfMonths(int months)

    • toRowInterval

      public static org.apache.flink.table.expressions.Expression toRowInterval(org.apache.flink.table.expressions.Expression e)

    • isFunctionOfKind

      public static boolean isFunctionOfKind(org.apache.flink.table.expressions.Expression expression, org.apache.flink.table.functions.FunctionKind kind)
      Checks if the expression is a function call of given type.
      Parameters:
      expression - expression to check
      kind - expected type of function
      Returns:
      true if the expression is function call of given type, false otherwise

    • isFunction

      public static boolean isFunction(org.apache.flink.table.expressions.Expression expression, org.apache.flink.table.functions.BuiltInFunctionDefinition functionDefinition)
      Checks if the given expression is a given builtin function.
      Parameters:
      expression - expression to check
      functionDefinition - expected function definition
      Returns:
      true if the given expression is a given function call