baremaps-calcite/src/main/java/org/apache/baremaps/calcite/BaremapsDdlExecutor.java [679:688]:
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    private ColumnDef(@Nullable SqlNode expr, RelDataType type,
        ColumnStrategy strategy) {
      this.expr = expr;
      this.type = type;
      this.strategy = requireNonNull(strategy, "strategy");
      checkArgument(
          strategy == ColumnStrategy.NULLABLE
              || strategy == ColumnStrategy.NOT_NULLABLE
              || expr != null);
    }
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baremaps-calcite/src/main/java/org/apache/baremaps/calcite/postgres/PostgresDdlExecutor.java [772:781]:
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    private ColumnDef(@Nullable SqlNode expr, RelDataType type,
        ColumnStrategy strategy) {
      this.expr = expr;
      this.type = type;
      this.strategy = requireNonNull(strategy, "strategy");
      checkArgument(
          strategy == ColumnStrategy.NULLABLE
              || strategy == ColumnStrategy.NOT_NULLABLE
              || expr != null);
    }
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