DATAJDBC-478 - Expose arguments of SimpleCondition and SimpleFunction.

We now allow introspection by exposing the arguments as function arguments and the condition expression could be subject to mapping metadata mapping.

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/SimpleCondition.java

@@ -50,10 +50,24 @@ public class SimpleCondition extends AbstractSegment implements Condition {
 		return new SimpleCondition(new Column(column, null), comparator, predicate);
 	}
 
+	/**
+	 * @return the condition expression (left-hand-side)
+	 * @since 2.0
+	 */
+	public Expression getExpression() {
+		return expression;
+	}
+
+	/**
+	 * @return the comparator.
+	 */
 	public String getComparator() {
 		return comparator;
 	}
 
+	/**
+	 * @return the condition predicate (right-hand-side)
+	 */
 	public String getPredicate() {
 		return predicate;
 	}

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/SimpleFunction.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.data.relational.core.sql;
 
+import java.util.Collections;
 import java.util.List;
 
 import org.springframework.util.Assert;
@@ -74,6 +75,14 @@ public class SimpleFunction extends AbstractSegment implements Expression {
 		return functionName;
 	}
 
+	/**
+	 * @return the function arguments.
+	 * @since 2.0
+	 */
+	public List<Expression> getExpressions() {
+		return Collections.unmodifiableList(expressions);
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see java.lang.Object#toString()