Package org.apache.calcite.sql
Interface SqlWriter.Frame
-
- All Known Implementing Classes:
SqlPrettyWriter.FrameImpl
- Enclosing interface:
- SqlWriter
public static interface SqlWriter.Frame
A Frame is a piece of generated text which shares a common indentation level.Every frame has a beginning, a series of clauses and separators, and an end. A typical frame is a comma-separated list. It begins with a "(", consists of expressions separated by ",", and ends with a ")".
A select statement is also a kind of frame. The beginning and end are are empty strings, but it consists of a sequence of clauses. "SELECT", "FROM", "WHERE" are separators.
A frame is current between a call to one of the
SqlWriter.startList(java.lang.String, java.lang.String)
methods and the call toSqlWriter.endList(Frame)
. If other code starts a frame in the mean time, the sub-frame is put onto a stack.