http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html#Expressions.OperatorsAndFunctions.Syntax
condition-expression ::= operand comparator operand | operand BETWEEN operand AND operand | operand IN ( operand (',' operand (, ...) )) | function | condition AND condition | condition OR condition | NOT condition | ( condition )
comparator ::= = | <> | < | <= | > | >=
function ::= attribute_exists (path) | attribute_not_exists (path) | attribute_type (path, type) | begins_with (path, substr) | contains (path, operand) | size (path)
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http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html#Expressions.OperatorsAndFunctions.Syntax
condition-expression ::= operand comparator operand | operand BETWEEN operand AND operand | operand IN ( operand (',' operand (, ...) )) | function | condition AND condition | condition OR condition | NOT condition | ( condition )
comparator ::= = | <> | < | <= | > | >=
function ::= attribute_exists (path) | attribute_not_exists (path) | attribute_type (path, type) | begins_with (path, substr) | contains (path, operand) | size (path)