danny0405 commented on a change in pull request #1679: [CALCITE-3620] Remove
implicit lateral operator for temporal table join
URL: https://github.com/apache/calcite/pull/1679#discussion_r360421067
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File path:
core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java
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@@ -4763,6 +4752,34 @@ private void validateAccess(
}
}
+ /**
+ * Validates snapshot to a table.
+ *
+ * @param node The node to validate
+ * @param scope Validator scope to derive type
+ * @param ns The namespace to lookup table
+ */
+ private void validateSnapshot(
+ SqlNode node,
+ SqlValidatorScope scope,
+ SqlValidatorNamespace ns) {
+ if (node.getKind() == SqlKind.SNAPSHOT) {
+ SqlSnapshot snapshot = (SqlSnapshot) node;
+ SqlNode period = snapshot.getPeriod();
+ RelDataType dataType = deriveType(scope, period);
+ if (dataType.getSqlTypeName() != SqlTypeName.TIMESTAMP) {
+ throw newValidationError(period,
+
Static.RESOURCE.illegalExpressionForTemporal(dataType.getSqlTypeName().getName()));
+ }
+ if (!ns.getTable().isTemporal()) {
+ List<String> qualifiedName = ns.getTable().getQualifiedName();
+ String tableName = qualifiedName.get(qualifiedName.size() - 1);
+ throw newValidationError(snapshot.getTableRef(),
+ Static.RESOURCE.notTemporalTable(tableName));
+ }
Review comment:
Tests were already there.
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