Creates relational expressions for a given AST node.
(Ast.Node node)
| 51 | |
| 52 | /** Creates relational expressions for a given AST node. */ |
| 53 | public Handler handle(Ast.Node node) { |
| 54 | final RelNode input; |
| 55 | final List<RexNode> rexNodes; |
| 56 | switch (node.op) { |
| 57 | case LOAD: |
| 58 | final Ast.LoadStmt load = (Ast.LoadStmt) node; |
| 59 | builder.scan((String) load.name.value); |
| 60 | register(load.target.value); |
| 61 | return this; |
| 62 | case VALUES: |
| 63 | final Ast.ValuesStmt values = (Ast.ValuesStmt) node; |
| 64 | final RelDataType rowType = toType(values.schema); |
| 65 | builder.values(tuples(values, rowType), rowType); |
| 66 | register(values.target.value); |
| 67 | return this; |
| 68 | case FOREACH: |
| 69 | final Ast.ForeachStmt foreach = (Ast.ForeachStmt) node; |
| 70 | builder.clear(); |
| 71 | input = map.get(foreach.source.value); |
| 72 | builder.push(input); |
| 73 | rexNodes = new ArrayList<>(); |
| 74 | for (Ast.Node exp : foreach.expList) { |
| 75 | rexNodes.add(toRex(exp)); |
| 76 | } |
| 77 | builder.project(rexNodes); |
| 78 | register(foreach.target.value); |
| 79 | return this; |
| 80 | case FOREACH_NESTED: |
| 81 | final Ast.ForeachNestedStmt foreachNested = (Ast.ForeachNestedStmt) node; |
| 82 | builder.clear(); |
| 83 | input = map.get(foreachNested.source.value); |
| 84 | builder.push(input); |
| 85 | System.out.println(input.getRowType()); |
| 86 | for (RelDataTypeField field : input.getRowType().getFieldList()) { |
| 87 | switch (field.getType().getSqlTypeName()) { |
| 88 | case ARRAY: |
| 89 | System.out.println(field); |
| 90 | break; |
| 91 | default: |
| 92 | break; |
| 93 | } |
| 94 | } |
| 95 | for (Ast.Stmt stmt : foreachNested.nestedStmtList) { |
| 96 | handle(stmt); |
| 97 | } |
| 98 | rexNodes = new ArrayList<>(); |
| 99 | for (Ast.Node exp : foreachNested.expList) { |
| 100 | rexNodes.add(toRex(exp)); |
| 101 | } |
| 102 | builder.project(rexNodes); |
| 103 | register(foreachNested.target.value); |
| 104 | return this; |
| 105 | case FILTER: |
| 106 | final Ast.FilterStmt filter = (Ast.FilterStmt) node; |
| 107 | builder.clear(); |
| 108 | input = map.get(filter.source.value); |
| 109 | builder.push(input); |
| 110 | RexNode rexNode = toRex(filter.condition); |