add @> condition for postgres

column.go

@@ -144,6 +144,9 @@ type Column interface {
 
 	// In creates Condition for "column IN (values[0], values[1] ...)".  Type for values is column's one or other Column.
 	In(values ...interface{}) Condition
+
+	// IntersectJSON creates Condition for "column @> value".  The value is a JSON string.
+	IntersectJSON(data string) Condition
 }
 
 type aliasedColumn interface {
@@ -319,6 +322,10 @@ func (left *columnImpl) In(val ...interface{}) Condition {
 	return newInCondition(left, val...)
 }
 
+func (left *columnImpl) IntersectJSON(data string) Condition {
+	return newIntersectJSONCondition(left, data)
+}
+
 func (b ColumnList) serialize(bldr *builder) {
 	first := true
 	for _, column := range b {
@@ -403,6 +410,10 @@ func (left *errorColumn) In(val ...interface{}) Condition {
 	return newInCondition(left, val...)
 }
 
+func (left *errorColumn) IntersectJSON(data string) Condition {
+	return newIntersectJSONCondition(left, data)
+}
+
 type aliasColumn struct {
 	column Column
 	alias  string
@@ -475,3 +486,7 @@ func (left *aliasColumn) Between(lower, higher interface{}) Condition {
 func (left *aliasColumn) In(val ...interface{}) Condition {
 	return newInCondition(left, val...)
 }
+
+func (left *aliasColumn) IntersectJSON(data string) Condition {
+	return newIntersectJSONCondition(left, data)
+}

condition.go

@@ -207,3 +207,25 @@ func (c *inCondition) columns() []Column {
 	}
 	return list
 }
+
+type intersectJSONCondition struct {
+	left Column
+	data serializable
+}
+
+func newIntersectJSONCondition(left Column, data string) Condition {
+	return &intersectJSONCondition{
+		left: left,
+		data: toLiteral(data),
+	}
+}
+
+func (c *intersectJSONCondition) serialize(bldr *builder) {
+	bldr.AppendItem(c.left)
+	bldr.Append(" @> ")
+	bldr.AppendItem(c.data)
+}
+
+func (c *intersectJSONCondition) columns() []Column {
+	return []Column{c.left}
+}

sqlfunc.go

@@ -100,6 +100,10 @@ func (left *sqlFuncImpl) In(vals ...interface{}) Condition {
 	return newInCondition(left, vals...)
 }
 
+func (left *sqlFuncImpl) IntersectJSON(data string) Condition {
+	return newIntersectJSONCondition(left, data)
+}
+
 func (m *sqlFuncImpl) columns() []Column {
 	return m.args
 }