amaliujia commented on a change in pull request #1647: [CALCITE-3588] Support
more operators in Join condition when convert …
URL: https://github.com/apache/calcite/pull/1647#discussion_r356953236
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File path:
core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java
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@@ -193,102 +193,12 @@ public Result setOpToSql(SqlSetOperator operator,
RelNode rel) {
* @param node Join condition
* @param leftContext Left context
* @param rightContext Right context
- * @param leftFieldCount Number of fields on left result
* @return SqlNode that represents the condition
*/
- public static SqlNode convertConditionToSqlNode(RexNode node,
- Context leftContext,
- Context rightContext,
- int leftFieldCount,
- SqlDialect dialect) {
- if (node.isAlwaysTrue()) {
- return SqlLiteral.createBoolean(true, POS);
- }
- if (node.isAlwaysFalse()) {
- return SqlLiteral.createBoolean(false, POS);
- }
- if (node instanceof RexInputRef) {
- Context joinContext = leftContext.implementor().joinContext(leftContext,
rightContext);
- return joinContext.toSql(null, node);
- }
- if (!(node instanceof RexCall)) {
- throw new AssertionError(node);
Review comment:
You mean cannot construct a valid SQL string in which a join condition is
not a RexCall?
I was thinking I could use RelBuilder to construct join, and then calls a
RelToSqlConvert.
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